Transfer of zero-order coherence matrix along spin-1/2 chain

被引：7

作者：

Bochkin, G. A. ^{[1
,2
]}

Fel'dman, E. B. ^{[1
,2
]}

Lazarev, I. D. ^{[1
,2
]}

Pechen, A. N. ^{[2
,3
]}

Zenchuk, A., I ^{[1
,2
]}

机构：

[1] RAS, Inst Problems Chem Phys, Chernogolovka 142432, Moscow Reg, Russia

[2] Russian Acad Sci, Steklov Math Inst, Gubkina Str 8, Moscow 119991, Russia

[3] Natl Univ Sci & Technol MISIS, Leninski Prosp 4, Moscow 119049, Russia

来源：

QUANTUM INFORMATION PROCESSING | 2022年 / 21卷 / 07期

关键词：

Zero-order coherence matrix; State transfer; State restoring; Spin chain; XX-Hamiltonian; Extended receiver; STATE; OPTIMIZATION; EVOLUTION;

D O I：

10.1007/s11128-022-03613-7

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this work, we study transfer of coherence matrices along spin-1/2 chains of various length. Unlike higher order coherence matrices, zero-order coherence matrix can be perfectly transferred if its elements are properly fixed. In certain cases, to provide the perfect transfer, an extended receiver together with optimized its unitary transformation has to be included into the protocol.In this work, the asymptotic perfectly transferable zero-order coherence matrix for an infinitely long chain is considered and deviation of a perfectly transferred state from this asymptotic state is studied as a function of the chain length for various sizes of the extended receiver. The problem of arbitrary parameter transfer via the nondiagonal elements of the zero-order coherence matrix is also considered and optimized using the unitary transformation of the extended receiver.

引用

页数：28

共 42 条

[1] 99%-fidelity ballistic quantum-state transfer through long uniform channels [J].