Remote interactions on two distributed quantum systems: nonlocal unambiguous quantum-state discrimination

• 来源期刊: 中国物理B（英文版）
• 关键词: remote quantum-state discrimination positive operator valued measure nonlocal controlled-rotation entanglement
• 年，卷（期）: 2008,（3）
• 页码范围: 778-784
• 页数: 7页
• 语种: 英文

摘要

Remote quantum-state discrimination is a critical step for the implementation of quantum communication network and distributed quantum computation. We present a protocol for remotely implementing the unambiguous discrimination between nonorthogonal states using quantum entanglements, local operations, and classical communications. This protocol consists of a remote generalized measurement described by a positive operator valued measurement (POVM).We explicitly construct the required remote POVM. The remote POVM can be realized by performing a noniocal controlled-rotation operation on two spatially separated qubits, one is an ancillary qubit and the other is the qubit which is encoded by two nonorthogonal states to be distinguished, and a conventional local Von Neumann orthogonal measurement on the ancilla. The particular pair of states that can be remotely and unambiguously distinguished is specified by the state of the ancilla. The probability of successful discrimination is not optimal for all admissible pairs.However, for some subset it can be very close to an optimal value in an ordinary local POVM.