Showing 2004 · quant-phShow all

16 papers · 2 filters

quant-ph2004★ 14 cited

Entanglement-assisted transformation is asymptotically equivalent to multiple-copy transformation

Runyao Duan, Yuan feng, Mingsheng Ying

We show that two ways of manipulation of quantum entanglement, namely, entanglement-assisted local transformation [D. Jonathan and M. B. Plenio, Phys. Rev. Lett. {\bf 83}, 3566 (19…

quant-ph2004★ 10 cited

Encoding a logical qubit into physical qubits

B. Zeng, D. L. Zhou, Z. Xu +2

We propose two protocols to encode a logical qubit into physical qubits relying on common types of qubit-qubit interactions in as simple forms as possible. We comment on its experi…

quant-ph2004★ 18 cited

Unambiguous discrimination of mixed quantum states

Chi Zhang, Yuan Feng, Ming Sheng Ying

In this paper, we consider the problem of unambiguous discrimination between a set of mixed quantum states. We first divide the density matrix of each mixed state into two parts by…

quant-ph2004★ 6 cited

Efficiency of Deterministic Entanglement Transformation

Runyao Duan, Yuan Feng, Zhengfeng Ji +1

We prove that sufficiently many copies of a bipartite entangled pure state can always be transformed into some copies of another one with certainty by local quantum operations and…

quant-ph2004★ 48 cited

Optimal conclusive discrimination of two states can be achieved locally

Zhengfeng Ji, Hongen Cao, Mingsheng Ying

This paper constructs a LOCC protocol that achieves the global optimality in conclusive discrimination of any two states with arbitrary a priori probability. This can be interprete…

quant-ph2004★ 22 cited

Limits to phase resolution in matter wave interferometry

M. Jääskeläinen, W. Zhang, P. Meystre

We study the quantum dynamics of a two-mode Bose-Einstein condensate in a time-dependent symmetric double-well potential using analytical and numerical methods. The effects of inte…

quant-ph2004★ 6 cited

Comparability of multipartite entanglement

Zhengfeng Ji, Runyao Duan, Mingsheng Ying

We prove, in a multipartite setting, that it's always feasible to exactly transform a genuinely -partite entangled state with sufficient many copies to any other -partite sta…

quant-ph2004★ 21 cited

Modularization of multi-qubit controlled phase gate and its NMR implementation

Jingfu Zhang, Wenzhang Liu, Zhiwei Deng +2

Quantum circuit network is a set of circuits that implements a certain computation task. Being at the center of the quantum circuit network, the multi-qubit controlled phase shift…

quant-ph2004★ 44 cited

Nuclear Magnetic Resonance Implementation of a Quantum Clock Synchronization Algorithm

Jingfu Zhang, Guilu Long, Zhiwei Deng +2

The quantum clock synchronization algorithm proposed by I. L. Chuang (Phys. Rev. Lett, 85, 2006(2000)) has been implemented in a three qubit nuclear magnetic resonance quantum syst…

quant-ph2004★ 842 cited

Efficient Multi-Party Quantum Secret Sharing Schemes

Li Xiao, Gui Lu Long, Fu-Guo Deng +1

In this work, we generalize the quantum secret sharing scheme of Hillary, Bužek and Berthiaume[Phys. Rev. A59, 1829(1999)] into arbitrary multi-parties. Explicit expressions for th…

quant-ph2004★ 1.2k cited

Secure Direct Communication with a Quantum One-Time-Pad

Fu-Guo Deng, Gui Lu Long

Quantum secure direct communication is the direct communication of secret messages without first producing a shared secret key. It maybe used in some urgent circumstances. Here we…

quant-ph2004★ 21 cited

Catalyst-assisted Probabilistic Entanglement Transformation

Yuan Feng, Runyao Duan, Mingsheng Ying

We are concerned with catalyst-assisted probabilistic entanglement transformations. A necessary and sufficient condition is presented under which there exist partial catalysts that…

quant-ph2004★ 47 cited

Multiple-copy entanglement transformation and entanglement catalysis

Runyao Duan, Yuan Feng, Xin Li +1

We prove that any multiple-copy entanglement transformation [S. Bandyopadhyay, V. Roychowdhury, and U. Sen, Phys. Rev. A \textbf{65}, 052315 (2002)] can be implemented by a suitabl…

quant-ph2004

Partial Recovery of Quantum Entanglement

Runyao Duan, Yuan Feng, Mingsheng Ying

Suppose Alice and Bob try to transform an entangled state shared between them into another one by local operations and classical communications. Then in general a certain amount of…

quant-ph2004★ 12 cited

When Catalysis is Useful for Probabilistic Entanglement Transformation

Yuan Feng, Runyao Duan, Mingsheng Ying

We determine all quantum states that can serve as useful catalysts for a given probabilistic entanglement transformation, in the sense that they can increase the maxima…

quant-ph2004★ 93 cited

Unambiguous discrimination between quantum mixed states

Yuan Feng, Runyao Duan, Mingsheng Ying

We prove that the states secretly chosen from a mixed state set can be perfectly discriminated if and only if these states are orthogonal. The sufficient and necessary condition wh…