Entanglement Virtualization After the First Quantum Key Teleportation Mario Mastriani

Total Page:16

File Type:pdf, Size:1020Kb

Entanglement Virtualization After the First Quantum Key Teleportation Mario Mastriani Entanglement virtualization after the first quantum key teleportation Mario Mastriani To cite this version: Mario Mastriani. Entanglement virtualization after the first quantum key teleportation. 2019. hal- 02083356v3 HAL Id: hal-02083356 https://hal.archives-ouvertes.fr/hal-02083356v3 Preprint submitted on 18 Aug 2019 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Entanglement virtualization after the first quantum key teleportation Mario Mastriani ORCID Id: 0000-0002-5627-3935 Abstract— In this draft, we present a new technique of quantum key distribution, where the first time the initial key is teleported, and after that, the entanglement is held in a fictitious way. In the transmitter, the new key is built with the previous key and the plaintext and with the new key and the plaintext we obtain the ciphertext. On the receiver side, with the previous key and the ciphertext we obtain the new key and with it and the ciphertext we obtain the plaintext. In other words, it is as if we emulate successive teleportations of the new keys that do not exist. Keywords—Quantum Entanglement; Quantum Key Distribution; Quantum Teleportation. 1 Introduction In the literature, there is a great amount of papers about Quantum Key Distribution (QKD); those which do not use quantum entanglement [1-10] and others which use it [11-18]. In our humble opinion, they all make an excessive exposure of the keys by using a pair of channels (classic and quantum) complementary to the channel that transports the ciphertext. See Fig.1. The idea behind this paper is the presentation of an enhanced QKD technique that minimizes such exposure. Fig. 1 Typical QKD architecture. 2 Enhanced QKD 2.1 How does it work? 1. An interlaced pair of the Einstein-Podolsky-Rosen (EPR) type is generated 2. Both EPRs are distributed between Alice and Bob 3. Teleportation [19-21] of the initial key is done k0 4. From Alice’s side and thanks the Boolean functions FA and GA we obtain the first ciphertext PT1 ,k 1 FA PT 1 ,k 0 and CT1 ,k 1 GA PT 1 ,k 1 (1) where PT is the plaintext and CT the ciphertext. In a generic way, PTi ,k i F A PT i ,k i1 and CTi ,k i G A PT i ,k i (2) 1 5. From Bob’s side and thanks to a couple of complementary Boolean functions FB and GB, we obtain the first plaintext, CT1 ,k 1 FB CT 1 ,k 0 and PT1 ,k 1 GB CT 1 ,k 1 (3) In a generic way, CTi ,k i F B CT i ,k i1 and PTi ,k i G B CT i ,k i (4) Fig. 2 Enhanced QKD. 6. The PTi can be portions of a message in frames, in such a way that the key changes with each frame, consequently, this automatic change of key could be given several times during the transmission of the same message. 2.2 Advantage 1. No human has ever knowledge of any key, not even their own and yet the keys change with each plot or portion of them. 2. There is never migration or distribution of any key by any channel, with the exception of initial teleportation. 3. As each message usually occupies several frames, with each frame the keys change. It can also be configured so that the process is applied several times during a frame. This causes that any hacker does not have the necessary latency to break a message, in fact, even a single frame. He cannot even perform an expert off-line intervention (batch or quasi-batch). 4. The corresponding functions can act from the messages themselves or according to a certain characteristic of them. 5. Since the functions used are Boolean, then: - there are no coding and decoding delays, - it is actually the encryption algorithm that is parameterized with the keys and therefore said algorithm changes with each frame or portion of the frame, - It is very easy to program, implement and maintain, and - It does not require additional occupation of the network service, i.e., accessory to the encrypted message itself. 2 6. nobody should remember a single key, or think about future keys, 7. It is ideal to be applied in: - blockchain - home banking - interbanking - government - defense - among others In fact, even a purely classical version can be applied to: - mobile phone communications. 3 Conclusions and Future Works The current quantum communications systems distribute public keys using a pair of additional channels (classical and quantum) to the channel used by the ciphertext, and they do this as a standard procedure. This causes the exposure of these keys to an apocryphal presence, as well as implies a culture of remembering keys and renewing them periodically. In this work, we have presented a new QKD protocol which minimizes said exposure. Competing Interests The author declares that there are no competing interests. Funding Statement The author acknowledges funding by LosWW under contract NMQCLC-06#5/1/2015. Acknowledgments M. Mastriani thanks boarding of LosWW for his tremendous help and support. References 1. Brassard, G., Salvail, L., Secret key reconciliation by Public discussion. Advances in Cryptology: Euro crypt 93 Proc. 410-23 (1993) 2. Gobby, C., Yuan, Z.L., Shields, A.J., Quantum key distribution over 122 km telecom fiber. Appl. Phys. Lett. 84, 3762–3764 (2002) 3. Gottesman, D., et al, Security of quantum key distribution with imperfect devices. Quantum Information Computation. 4, 325–360 (2004) 4. Gordon, K.J., et al, Quantum key distribution system clocked at 2 GHz, Optics Express 13, 3015– 3020 (2005) 5. Henle, F., BB84 online demo <http://monet.mercersburg.edu/henle/bb84/>. An online demonstration of the original BB84 algorithm from, Bennett et al. (1991) 6. Bennett, C.H., Quantum cryptography using any two no orthogonal states, Phys. Rev. Letter, 68:21, 3121-3124 (1992) 7. Haitjema, M., A Survey of the Prominent Quantum Key Distribution Protocols http://www.cs.wustl.edu/~jain/cse571-07/ftp/quantum/index.html#b92 8. Scarani, A., et al., Quantum Cryptography protocols robust against Photon number Splitting attack. PRL, 92 (2004) http://www.qci.jst.go.jp/eqsi03/program/papers/O26-Scarani.pdf 9. Gisin, N., talk presented at the workshop on Quantum Computation, Torino. July 1997; D. bruss. Physical review letter. 81:3018 (1998) 10. Bechmann-Pasquinucci, H., Gisin. N., Incoherent and coherent eavesdropping in the six-state protocol of quantum cryptography. Phys. Rev. Letter, A59, 4238-4248 (1999) 11. Gisin, N., et al, Quantum Cryptography, Review of Modern Physics, 74:1, 145-194 (2002) 12. Stucki, D., et al., Appl. Phys. Lett., 87, 194108 (2005) 13. Gisin, N., et al, Towards practical and fast quantum cryptography, arXiv:quant-ph/0411022 (2004) 3 14. Inoue, K., Waks, E., Yamanoto, Y., Differential-phase-shift quantum key distribution using coherent light. Phys. Rev. A 68.022317 (2003) 15. Waks, E., Takesue, H. Yamamoto, Y., Security of differential-Phase-Shift quantum key distribution against individual attacks. PRA, 73:012344 (2006) 16. Khan, M.M., et al. “High error-rate quantum key distribution for long distance communication” New J. Phys. 11 063043 http://iopscience.iop.org/1367-2630/11/6/063043/ 17. Hernandez Serna, E.E. Quantum Key Distribution protocol with private- public key arXiv: 0908.2146v4 quant-ph (2012) 18. Hernandez Serna, E.E. Quantum Key Distribution from a random seed. arXiv:1311.1582v2 quant-ph (2013) 19. Mastriani, M.: Teleporting Digital Images. <hal-02064813v1> (2019) 20. Mastriani, M.: Every entangled stuff has its own avatar. <hal-01655231v8> (2019) 21. Mastriani, M.: Simplified protocol of quantum teleportation. <hal-01833706v8> (2019) 4 .
Recommended publications
  • Security of Quantum Key Distribution with Entangled Qutrits
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by CERN Document Server Security of Quantum Key Distribution with Entangled Qutrits. Thomas Durt,1 Nicolas J. Cerf,2 Nicolas Gisin,3 and Marek Zukowski˙ 4 1 Toegepaste Natuurkunde en Fotonica, Theoeretische Natuurkunde, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium 2 Ecole Polytechnique, CP 165, Universit´e Libre de Bruxelles, 1050 Brussels, Belgium 3 Group of Applied Physics - Optique, Universit´e de Gen`eve, 20 rue de l’Ecole de M´edecine, Gen`eve 4, Switzerland, 4Instytut Fizyki Teoretycznej i Astrofizyki Uniwersytet, Gda´nski, PL-80-952 Gda´nsk, Poland July 2002 Abstract The study of quantum cryptography and quantum non-locality have traditionnally been based on two-level quantum systems (qubits). In this paper we consider a general- isation of Ekert's cryptographic protocol[20] where qubits are replaced by qutrits. The security of this protocol is related to non-locality, in analogy with Ekert's protocol. In order to study its robustness against the optimal individual attacks, we derive the infor- mation gained by a potential eavesdropper applying a cloning-based attack. Introduction Quantum cryptography aims at transmitting a random key in such a way that the presence of an eavesdropper that monitors the communication is revealed by disturbances in the transmission of the key (for a review, see e.g. [21]). Practically, it is enough in order to realize a crypto- graphic protocol that the key signal is encoded into quantum states that belong to incompatible bases, as in the original protocol of Bennett and Brassard[4].
    [Show full text]
  • Large Scale Quantum Key Distribution: Challenges and Solutions
    Large scale quantum key distribution: challenges and solutions QIANG ZHANG,1,2 FEIHU XU,1,2 YU-AO CHEN,1,2 CHENG-ZHI PENG1,2 AND JIAN-WEI PAN1,2,* 1Shanghai Branch, Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Shanghai, 201315, China 2CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, P. R. China *[email protected], [email protected] Abstract: Quantum key distribution (QKD) together with one time pad encoding can provide information-theoretical security for communication. Currently, though QKD has been widely deployed in many metropolitan fiber networks, its implementation in a large scale remains experimentally challenging. This letter provides a brief review on the experimental efforts towards the goal of global QKD, including the security of practical QKD with imperfect devices, QKD metropolitan and backbone networks over optical fiber and satellite-based QKD over free space. 1. Introduction Quantum key distribution (QKD) [1,2], together with one time pad (OTP) [3] method, provides a secure means of communication with information-theoretical security based on the basic principle of quantum mechanics. Light is a natural and optimal candidate for the realization of QKD due to its flying nature and its compatibility with today’s fiber-based telecom network. The ultimate goal of the field is to realize a global QKD network for worldwide applications. Tremendous efforts have been put towards this goal [4–6]. Despite significant progresses over the past decades, there are still two major challenges for large-scale QKD network.
    [Show full text]
  • Machine Learning Aided Carrier Recovery in Continuous-Variable Quantum Key Distribution
    Machine Learning Aided Carrier Recovery in Continuous-Variable Quantum Key Distribution T Gehring1, H-M Chin1,2, N Jain1, D Zibar2, and U L Andersen1 1Department of Physics, Technical University of Denmark, Lyngby, Denmark 2Department of Photonics, Technical University of Denmark, Lyngby, Denmark Contact Email: [email protected] Continuous-variable quantum key distribution (CV-QKD) makes use of in-phase and quadrature mod- ulation and coherent detection to distribute secret keys between two parties for data encryption with future proof security. The secret key rate of such CV-QKD systems is limited by excess noise, which is attributed to an eavesdropper. A key issue typical to all modern CV-QKD systems implemented with a reference or pilot signal and an independent local oscillator is controlling the excess noise generated from the fre- quency and phase noise accrued by the transmitter and receiver. Therefore accurate phase estimation and compensation, so-called carrier recovery, is a critical subsystem of CV-QKD. Here, we present the implementation of a machine learning framework based on Bayesian inference, namely an unscented Kalman filter (UKF), for estimation of phase noise and compare it to a standard reference method. Experimental results obtained over a 20 km fiber-optic link indicate that the UKF can ensure very low excess noise even at low pilot powers. The measurements exhibited low variance and high stability in excess noise over a wide range of pilot signal to noise ratios. The machine learning framework may enable CV-QKD systems with low implementation complexity, which can seamlessly work on diverse transmission lines, and it may have applications in the implemen- tation of other cryptographic protocols, cloud-based photonic quantum computing, as well as in quantum sensing..
    [Show full text]
  • SECURING CLOUDS – the QUANTUM WAY 1 Introduction
    SECURING CLOUDS – THE QUANTUM WAY Marmik Pandya Department of Information Assurance Northeastern University Boston, USA 1 Introduction Quantum mechanics is the study of the small particles that make up the universe – for instance, atoms et al. At such a microscopic level, the laws of classical mechanics fail to explain most of the observed phenomenon. At such a state quantum properties exhibited by particles is quite noticeable. Before we move forward a basic question arises that, what are quantum properties? To answer this question, we'll look at the basis of quantum mechanics – The Heisenberg's Uncertainty Principle. The uncertainty principle states that the more precisely the position is determined, the less precisely the momentum is known in this instant, and vice versa. For instance, if you measure the position of an electron revolving around the nucleus an atom, you cannot accurately measure its velocity. If you measure the electron's velocity, you cannot accurately determine its position. Equation for Heisenberg's uncertainty principle: Where σx standard deviation of position, σx the standard deviation of momentum and ħ is the reduced Planck constant, h / 2π. In a practical scenario, this principle is applied to photons. Photons – the smallest measure of light, can exist in all of their possible states at once and also they don’t have any mass. This means that whatever direction a photon can spin in -- say, diagonally, vertically and horizontally -- it does all at once. This is exactly the same as if you constantly moved east, west, north, south, and up-and-down at the same time.
    [Show full text]
  • Lecture 12: Quantum Key Distribution. Secret Key. BB84, E91 and B92 Protocols. Continuous-Variable Protocols. 1. Secret Key. A
    Lecture 12: Quantum key distribution. Secret key. BB84, E91 and B92 protocols. Continuous-variable protocols. 1. Secret key. According to the Vernam theorem, any message (for instance, consisting of binary symbols, 01010101010101), can be encoded in an absolutely secret way if the one uses a secret key of the same length. A key is also a sequence, for instance, 01110001010001. The encoding is done by adding the message and the key modulo 2: 00100100000100. The one who knows the key can decode the encoded message by adding the key to the message modulo 2. The important thing is that the key should be used only once. It is exactly this way that classical cryptography works. Therefore the only task of quantum cryptography is to distribute the secret key between just two users (conventionally called Alice and Bob). This is Quantum Key Distribution (QKD). 2. BB84 protocol, proposed in 1984 by Bennett and Brassard – that’s where the name comes from. The idea is to encode every bit of the secret key into the polarization state of a single photon. Because the polarization state of a single photon cannot be measured without destroying this photon, this information will be ‘fragile’ and not available to the eavesdropper. Any eavesdropper (called Eve) will have to detect the photon, and then she will either reveal herself or will have to re-send this photon. But then she will inevitably send a photon with a wrong polarization state. This will lead to errors, and again the eavesdropper will reveal herself. The protocol then runs as follows.
    [Show full text]
  • Gr Qkd 003 V2.1.1 (2018-03)
    ETSI GR QKD 003 V2.1.1 (2018-03) GROUP REPORT Quantum Key Distribution (QKD); Components and Internal Interfaces Disclaimer The present document has been produced and approved by the Group Quantum Key Distribution (QKD) ETSI Industry Specification Group (ISG) and represents the views of those members who participated in this ISG. It does not necessarily represent the views of the entire ETSI membership. 2 ETSI GR QKD 003 V2.1.1 (2018-03) Reference RGR/QKD-003ed2 Keywords interface, quantum key distribution ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88 Important notice The present document can be downloaded from: http://www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx If you find errors in the present document, please send your comment to one of the following services: https://portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI.
    [Show full text]
  • Scalable Quantum Cryptography Network for Protected Automation Communication Making Quantum Key Distribution (QKD) Available to Critical Energy Infrastructure
    Scalable Quantum Cryptography Network for Protected Automation Communication Making quantum key distribution (QKD) available to critical energy infrastructure Background changes the key in an immediate and Benefits measurable way, reducing the risk that The power grid is increasingly more reliant information thought to be securely • QKD lets the operator know, in real- on a distributed network of automation encrypted has actually been compromised. time, if a secret key has been stolen components such as phasor measurement units (PMUs) and supervisory control and Objectives • Reduces the risk that a “man-in-the- data acquisition (SCADA) systems, to middle” cyber-attack might allow In the past, QKD solutions have been unauthorized access to energy manage the generation, transmission and limited to point-to-point communications sector data distribution of electricity. As the number only. To network many devices required of deployed components has grown dedicated QKD systems to be established Partners rapidly, so too has the need for between every client on the network. This accompanying cybersecurity measures that resulted in an expensive and complex • Qubitekk, Inc. (lead) enable the grid to sustain critical functions network of multiple QKD links. To • Oak Ridge National Laboratory even during a cyber-attack. To protect achieve multi-client communications over (ORNL) against cyber-attacks, many aspects of a single quantum channel, Oak Ridge cybersecurity must be addressed in • Schweitzer Engineering Laboratories National Laboratory (ORNL) developed a parallel. However, authentication and cost-effective solution that combined • EPB encryption of data communication between commercial point-to-point QKD systems • University of Tennessee distributed automation components is of with a new, innovative add-on technology particular importance to ensure resilient called Accessible QKD for Cost-Effective energy delivery systems.
    [Show full text]
  • Detecting Itinerant Single Microwave Photons Sankar Raman Sathyamoorthy A, Thomas M
    Physics or Astrophysics/Header Detecting itinerant single microwave photons Sankar Raman Sathyamoorthy a, Thomas M. Stace b and G¨oranJohansson a aDepartment of Microtechnology and Nanoscience, MC2, Chalmers University of Technology, S-41296 Gothenburg, Sweden bCentre for Engineered Quantum Systems, School of Physical Sciences, University of Queensland, Saint Lucia, Queensland 4072, Australia Received *****; accepted after revision +++++ Abstract Single photon detectors are fundamental tools of investigation in quantum optics and play a central role in measurement theory and quantum informatics. Photodetectors based on different technologies exist at optical frequencies and much effort is currently being spent on pushing their efficiencies to meet the demands coming from the quantum computing and quantum communication proposals. In the microwave regime however, a single photon detector has remained elusive although several theoretical proposals have been put forth. In this article, we review these recent proposals, especially focusing on non-destructive detectors of propagating microwave photons. These detection schemes using superconducting artificial atoms can reach detection efficiencies of 90% with existing technologies and are ripe for experimental investigations. To cite this article: S.R. Sathyamoorthy, T.M. Stace ,G.Johansson, C. R. Physique XX (2015). R´esum´e La d´etection... Pour citer cet article : S.R. Sathyamoorthy, T.M. Stace , G.Johansson, C. R. Physique XX (2015). Key words: Single photon detection, quantum nondemolition, superconducting circuits, microwave photons Mots-cl´es: Mot-cl´e1; Mot-cl´e2; Mot-cl´e3 arXiv:1504.04979v1 [quant-ph] 20 Apr 2015 1. Introduction In 1905, his annus mirabilis, Einstein not only postulated the existence of light quanta (photons) while explaining the photoelectric effect but also gave a theory (arguably the first) of a photon detector [1].
    [Show full text]
  • Quantum Cryptography Using Quantum Key Distribution and Its Applications
    International Journal of Engineering and Advanced Technology (IJEAT) ISSN: 2249 – 8958, Volume-3, Issue-4, April 2014 Quantum Cryptography using Quantum Key Distribution and its Applications N.Sasirekha, M.Hemalatha Abstract-Secure transmission of message between the sender and receiver is carried out through a tool called as cryptography. Traditional cryptographical methods use either public key which is known to everyone or on the private key. In either case the eavesdroppers are able to detect the key and hence find the message transmitted without the knowledge of the sender and receiver. Quantum cryptography is a special form of cryptography which uses the Quantum mechanics to ensure unconditional security towards the transmitted message. Quantum cryptography uses the distribution of random binary key known as the Quantum Key Distribution (QKD) and hence enables the communicating parties to detect the presence of potential eavesdropper. This paper also analyses few application areas of quantum cryptography and its limitations. Keywords- Classical Cryptography, Photon polarization, Qubit, Quantum Cryptography, Quantum entanglement, Quantum Key Fig 1: Communication in the presence of an Eavesdropper Distribution, Sifting key. I. INTRODUCTION Today, a technology known as Quantum key distribution (QKD) uses individual photons for the exchange of Cryptography is the practice and study of encoding and cryptographic key between the sender and the receiver. Each decoding secret messages to ensure secure communications. photon represents a single bit of data. The value of the bit, a 1 There are two main branches of cryptography: or a 0, is determined by states of the photon such as secret-(symmetric-) key cryptography and public- polarization or spin.
    [Show full text]
  • Quantum Key Distribution (QKD); QKD Module Security Specification
    ETSI GS QKD 008 V1.1.1 (2010-12) Group Specification Quantum Key Distribution (QKD); QKD Module Security Specification Disclaimer This document has been produced and approved by the Quantum Key Distribution (QKD) ETSI Industry Specification Group (ISG) and represents the views of those members who participated in this ISG. It does not necessarily represent the views of the entire ETSI membership 2 ETSI GS QKD 008 V1.1.1 (2010-12) Reference DGS/QKD-0008 Keywords analysis, protocols, Quantum Key Distribution, security, system ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88 Important notice Individual copies of the present document can be downloaded from: http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http://portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http://portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written permission.
    [Show full text]
  • Deterministic Secure Quantum Communication on the BB84 System
    entropy Article Deterministic Secure Quantum Communication on the BB84 System Youn-Chang Jeong 1, Se-Wan Ji 1, Changho Hong 1, Hee Su Park 2 and Jingak Jang 1,* 1 The Affiliated Institute of Electronics and Telecommunications Research Institute, P.O.Box 1, Yuseong Daejeon 34188, Korea; [email protected] (Y.-C.J.); [email protected] (S.-W.J.); [email protected] (C.H.) 2 Korea Research Institute of Standards and Science, Daejeon 43113, Korea; [email protected] * Correspondence: [email protected]; Tel.: +82-42-870-2134 Received: 23 September 2020; Accepted: 6 November 2020; Published: 7 November 2020 Abstract: In this paper, we propose a deterministic secure quantum communication (DSQC) protocol based on the BB84 system. We developed this protocol to include quantum entity authentication in the DSQC procedure. By first performing quantum entity authentication, it was possible to prevent third-party intervention. We demonstrate the security of the proposed protocol against the intercept-and-re-send attack and the entanglement-and-measure attack. Implementation of this protocol was demonstrated for quantum channels of various lengths. Especially, we propose the use of the multiple generation and shuffling method to prevent a loss of message in the experiment. Keywords: optical communication; quantum cryptography; quantum mechanics 1. Introduction By using the fundamental postulates of quantum mechanics, quantum cryptography ensures secure communication among legitimate users. Many quantum cryptography schemes have been developed since the introduction of the BB84 protocol in 1984 [1] by C. H. Bennett and G. Brassard. In the BB84 protocol, the sender uses a rectilinear or diagonal basis to encode information in single photons.
    [Show full text]
  • Quantum Key Distribution Over a 40-Db Channel Loss Using Superconducting Single-Photon Detectors
    Black plate (343,1) ARTICLES Quantum key distribution over a 40-dB channel loss using superconducting single-photon detectors HIROKI TAKESUE1*, SAE WOO NAM2,QIANGZHANG3,ROBERTH.HADFIELD2†, TOSHIMORI HONJO1, KIYOSHI TAMAKI1 AND YOSHIHISA YAMAMOTO3,4 1NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan 2National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA 3E. L. Ginzton Laboratory, Stanford University, 450 Via Palou, Stanford, California 94305-4088, USA 4National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan †Present address: Department of Physics, Heriot-Watt University, Edinburgh, EH14 4AS, United Kingdom *e-mail: [email protected] Published online: 1 June 2007; doi:10.1038/nphoton.2007.75 We report the first quantum key distribution (QKD) experiment to enable the creation of secure keys over 42 dB channel loss and 200 km of optical fibre. We used the differential phase shift QKD (DPS-QKD) protocol, implemented with a 10-GHz clock frequency and superconducting single-photon detectors (SSPD) based on NbN nanowires. The SSPD offers a very low dark count rate (a few Hz) and small timing jitter (60 ps, full width at half maximum, FWHM). These characteristics allowed us to achieve a 12.1 bit s21 secure key rate over 200 km of fibre, which is the longest terrestrial QKD over a fibre link yet demonstrated. Moreover, this is the first 10-GHz clock QKD system to enable secure key generation. The keys generated in our experiment are secure against both general collective attacks on individual photons and a specific collective attack on multiphotons, known as a sequential unambiguous state discrimination (USD) attack.
    [Show full text]