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An Infinite Dimensional Birkhoff's Theorem and LOCC-Convertibility

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An Infinite Dimensional Birkhoff's Theorem and LOCC-Convertibility An infinite dimensional Birkhoff's Theorem and LOCC-convertibility Daiki Asakura Graduate School of Information Systems, The University of Electro-Communications, Tokyo, Japan August 29, 2016 Preliminary and Notation[1/13] Birkhoff's Theorem (: matrix analysis(math)) & in infinite dimensinaol Hilbert space LOCC-convertibility (: quantum information ) Notation H, K : separable Hilbert spaces. (Unless specified otherwise dim = 1) j i; jϕi 2 H ⊗ K : unit vectors. P1 P1 majorization: for σ = a jx ihx j, ρ = b jy ihy j 2 S(H), P Pn=1 n n n n=1 n n n ≺ () n # ≤ n # 8 2 N σ ρ i=1 ai i=1 bi ; n . def j i ! j i () 9 2 N [ f1g 9 H f gn 9 ϕ n , POVM on Mi i=1 and a set of LOCC def K f gn unitary on Ui i=1 s.t. Xn j ih j ⊗ j ih j ∗ ⊗ ∗ ϕ ϕ = (Mi Ui ) (Mi Ui ); in C1(H): i=1 H jj · jj "in C1(H)" means the convergence in Banach space (C1( ); 1) when n = 1. LOCC-convertibility[2/13] Theorem(Nielsen, 1999)[1][2, S12.5.1] : the case dim H, dim K < 1 j i ! jϕi () TrK j ih j ≺ TrK jϕihϕj LOCC Theorem(Owari et al, 2008)[3] : the case of dim H, dim K = 1 j i ! jϕi =) TrK j ih j ≺ TrK jϕihϕj LOCC TrK j ih j ≺ TrK jϕihϕj =) j i ! jϕi ϵ−LOCC where " ! " means "with (for any small) ϵ error by LOCC". ϵ−LOCC TrK j ih j ≺ TrK jϕihϕj ) j i ! jϕi in infinite dimensional space has LOCC been open. Our main purpose is to give an answer to this open problem. [1]M. A. Nielsen, "Condition for a class of entanglement transformations", Physical Review Letters, Vol.83-2 :436-439(1999) [2]M A Nielesen, I L Chuang, Quantum Computation and Quantum Information, Cambrige University Press, Cambrige, 2000. [3]M. Owari, S. L. Braunstein, K. Nemoto, M. Murao, "ε-convertibility of entangled states and extension of Schmidt rank in infinite dimensional systems", Quantum Information and Computation, Vol.8 :30-52(2008) LOCC-convertibility[2/13] Theorem(Nielsen, 1999)[1][2, S12.5.1] : the case dim H, dim K < 1 j i ! jϕi () TrK j ih j ≺ TrK jϕihϕj LOCC Theorem(Owari et al, 2008)[3] : the case of dim H, dim K = 1 j i ! jϕi =) TrK j ih j ≺ TrK jϕihϕj LOCC TrK j ih j ≺ TrK jϕihϕj =) j i ! jϕi ϵ−LOCC where " ! " means "with (for any small) ϵ error by LOCC". ϵ−LOCC TrK j ih j ≺ TrK jϕihϕj ) j i ! jϕi in infinite dimensional space has LOCC been open. Our main purpose is to give an answer to this open problem. [1]M. A. Nielsen, "Condition for a class of entanglement transformations", Physical Review Letters, Vol.83-2 :436-439(1999) [2]M A Nielesen, I L Chuang, Quantum Computation and Quantum Information, Cambrige University Press, Cambrige, 2000. [3]M. Owari, S. L. Braunstein, K. Nemoto, M. Murao, "ε-convertibility of entangled states and extension of Schmidt rank in infinite dimensional systems", Quantum Information and Computation, Vol.8 :30-52(2008) LOCC-convertibility[2/13] Theorem(Nielsen, 1999)[1][2, S12.5.1] : the case dim H, dim K < 1 j i ! jϕi () TrK j ih j ≺ TrK jϕihϕj LOCC Theorem(Owari et al, 2008)[3] : the case of dim H, dim K = 1 j i ! jϕi =) TrK j ih j ≺ TrK jϕihϕj LOCC TrK j ih j ≺ TrK jϕihϕj =) j i ! jϕi ϵ−LOCC where " ! " means "with (for any small) ϵ error by LOCC". ϵ−LOCC TrK j ih j ≺ TrK jϕihϕj ) j i ! jϕi in infinite dimensional space has LOCC been open. Our main purpose is to give an answer to this open problem. [1]M. A. Nielsen, "Condition for a class of entanglement transformations", Physical Review Letters, Vol.83-2 :436-439(1999) [2]M A Nielesen, I L Chuang, Quantum Computation and Quantum Information, Cambrige University Press, Cambrige, 2000. [3]M. Owari, S. L. Braunstein, K. Nemoto, M. Murao, "ε-convertibility of entangled states and extension of Schmidt rank in infinite dimensional systems", Quantum Information and Computation, Vol.8 :30-52(2008) Birkhoff theorem[3/13] TrK j ih j ≺ TrK jϕihϕj ) j i ! jϕi in finite dimensional space (?) is LOCC proved by Birkhoff's theorem. Theorem(Birkhoff 1946)[4] (i) exfd × d doubly stochastic matrixg = fd × d permutationg, (ii) any doubly stochastic matrix can be represented as a finite convex combination of permutation matrices, (iii) fd × d doubly stochastic matrixg = cofd × d permutationg = cofd × d permutationg: (ii) is used in the proof of (?). infinite dimensional analogue of Birkhoff's Theorem ' Birkoff's problem 111 But, we can not use known results for Birkhoff's problem 111, since no one treated in any study (ii) in infinite dimensional space! We construct an infinite dimensional analogue of (ii), and using this, we want to get an infinite dimensional analogue of (?). [4]G. Birkhoff. "Three observations on linear algebra".(Spanish) Univ. Nac. Tucuman. Revista A. 5 :137-151(1946) Birkhoff theorem[3/13] TrK j ih j ≺ TrK jϕihϕj ) j i ! jϕi in finite dimensional space (?) is LOCC proved by Birkhoff's theorem. Theorem(Birkhoff 1946)[4] (i) exfd × d doubly stochastic matrixg = fd × d permutationg, (ii) any doubly stochastic matrix can be represented as a finite convex combination of permutation matrices, (iii) fd × d doubly stochastic matrixg = cofd × d permutationg = cofd × d permutationg: (ii) is used in the proof of (?). infinite dimensional analogue of Birkhoff's Theorem ' Birkoff's problem 111 But, we can not use known results for Birkhoff's problem 111, since no one treated in any study (ii) in infinite dimensional space! We construct an infinite dimensional analogue of (ii), and using this, we want to get an infinite dimensional analogue of (?). [4]G. Birkhoff. "Three observations on linear algebra".(Spanish) Univ. Nac. Tucuman. Revista A. 5 :137-151(1946) Birkhoff theorem[3/13] TrK j ih j ≺ TrK jϕihϕj ) j i ! jϕi in finite dimensional space (?) is LOCC proved by Birkhoff's theorem. Theorem(Birkhoff 1946)[4] (i) exfd × d doubly stochastic matrixg = fd × d permutationg, (ii) any doubly stochastic matrix can be represented as a finite convex combination of permutation matrices, (iii) fd × d doubly stochastic matrixg = cofd × d permutationg = cofd × d permutationg: (ii) is used in the proof of (?). infinite dimensional analogue of Birkhoff's Theorem ' Birkoff's problem 111 But, we can not use known results for Birkhoff's problem 111, since no one treated in any study (ii) in infinite dimensional space! We construct an infinite dimensional analogue of (ii), and using this, we want to get an infinite dimensional analogue of (?). [4]G. Birkhoff. "Three observations on linear algebra".(Spanish) Univ. Nac. Tucuman. Revista A. 5 :137-151(1946) Definition of D(H), P(H) etc [4/13] P j i 1 1 j ih j For a fixed CONS ( i )i=1, we define the sets of bounded operators i;j=1 aij i j as follows: X1 X1 (P(H)) : aij 2 f0; 1g; aij = 1; aij = 1(8i; j) permutation j=1 i=1 X1 X1 (P0(H)) : aij 2 f0; 1g; aij ≤ 1; aij ≤ 1(8i; j) subpermutation j=1 i=1 X1 X1 (D(H)) : aij 2 [0; 1]; aij = 1and aij = 1(8i; j) doubly stochastic j=1 i=1 X1 X1 (D0(H)) : aij 2 [0; 1]; aij ≤ 1; aij ≤ 1(8i; j) doubly substochastic j=1 i=1 remark Any element of P(H) is unitary on H. This is a generalization of the fact that any permutation matrix is unitary. Main result 1: Birkhoff's thm in infinite dim. with WOT [5/13] Theorem1(Asakura) For a separable infinite dimensional H, we have (i) ex D(H) = P(H). (ii) [integral representation of D(H)] For any D 2 D(H), there exist a P H probability measure µD on ( )Z such that D = WOT - XdµD (X ): P(H) w (iii) co P(H) ( D(H) ( co (P(H)) = D0(H). d d Theorem(Birkoff)[rewrite] : the case H = C and (jii)i =the standard basis in C D H P H (i) ex ( ) = ( ). P 2 D H f gd! d! (ii) For any D ( ), there exists a probability pi i=1 s.t. D = i=1 pi Pi ; f gd! P H where Pi i=1 := ( ) (iii) D(H) = co P(H) = coP(H). Main result 1: Birkhoff's thm in infinite dim. with WOT [5/13] Theorem1(Asakura) For a separable infinite dimensional H, we have (i) ex D(H) = P(H). (ii) [integral representation of D(H)] For any D 2 D(H), there exist a P H probability measure µD on ( )Z such that D = WOT - XdµD (X ): P(H) w (iii) co P(H) ( D(H) ( co (P(H)) = D0(H). d d Theorem(Birkoff)[rewrite] : the case H = C and (jii)i =the standard basis in C D H P H (i) ex ( ) = ( ). P 2 D H f gd! d! (ii) For any D ( ), there exists a probability pi i=1 s.t. D = i=1 pi Pi ; f gd! P H where Pi i=1 := ( ) (iii) D(H) = co P(H) = coP(H). Main results 2: a sufficient condition in infinite dim. [6/13] Using Theorem 1 (ii), we get the following: Theorem2(Asakura) Let j i and jϕi be full rank unit vectors. If TrKj ih j ≺ TrKjϕihϕj, then ◦ there exist a probability measure µD on P(H), a dense subspace H0 ⊂ H a set of densely defined unbounded operators fMX gX 2P(H) on H with D(MX ) ⊃ H0(8X 2 P(H)) satisfying "some conditions" such that Z j ih j ⊗ ∗ j ih j ∗ ⊗ H ϕ ϕ = (MX X ) (MX X )dµD (X ); in C1( ) (a) P(H) R h j ∗ j i h j i 8 2 H and P(H) η MX MX ξ dµD (X ) = η ξ η; ξ 0 (b) hold.
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