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Chinese Physics B 2012年第11期21卷 85-93页

作者：曹聪王川张茹 School of Science Beijing University of Posts and Telecommunications

We propose a practical entanglement concentration protocol （ECP） for a hybrid entangled state using quantum dots and a microcavity coupled system. A hybrid less-entangled state can he concentrated to a most-entangled state with a certain probability using only one ancillary single photon. Moreover, using this protocol, we can also concentrate an arbitrary three-particle less-entangled W state using two ancillary photons and classical communication. The proposed protocols provide us with a useful method to concentrate less-entangled states, which can he implemented with current technology.

关键词： entanglement concentration quantum dot microcavity W state

entanglement concentration for W-type entangled coherent states

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Chinese Physics B 2014年第8期23卷 269-273页

作者：盛宇波刘炯赵圣阳王磊周澜 Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and TelecommunicationsMinistry of Education Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications College of Mathematics and Physics Nanjing University of Posts and Telecommunications

An entangled coherent state （ECS） is one type of entanglement, which is widely discussed in the application of quan- tum information processing （QIP）. In this paper, we propose an entanglement concentration protocol （ECP） to distill the maximally entangled W-type ECS from the partially entangled W-type ECS. In the ECP, we adopt the balanced beam split- ter （BS） to make the parity check measurement. Our ECP is quite different from the conventional ECPs. After performing the ECP, not only can we obtain the maximally entangled ECS with some success probability, but also we can increase the amplitude of the coherent state. Therefore, it is especially useful in long-distance quantum communication, if the photon loss is considered.

关键词： quantum communication and computation entanglement concentration coherent state

Electronic cluster state entanglement concentration based on charge detection

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Chinese Physics B 2014年第2期23卷 138-143页

作者：刘炯赵圣阳周澜盛宇波 Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and TelecommunicationsMinistry of Education Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications College of Mathematics & Physics Nanjing University of Posts and Telecommunications

We propose an efficient entanglement concentration protocol （ECP） based on electron-spin cluster states assisted with single electrons. In the ECP, we adopt the electron polarization beam splitter （PBS） and the charge detector to construct the quantum nondemolition measurement. According to the result of the measurement of the charge detection, we can ultimately obtain the maximally entangled cluster states. Moreover, the discarded items can be reused in the next round to reach a high success probability. This ECP may be useful in current solid quantum computation.

关键词： entanglement concentration quantum computation cluster states

Multipartite entanglement concentration of electron-spin states with CNOT gates

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Chinese Physics B 2012年第9期21卷 88-93页

作者：任宝藏华明李涛杜芳芳邓富国 Department of Physics Applied Optics Beijing Area Major LaboratoryBeijing Normal University

We propose a different entanglement concentration protocol （ECP） for nonlocal N-electron systems in a partially entangled Bell-type pure state using the CNOT gates and the projection measurements on an additional electron. For each nonlocal N-electron system, Alice first entangles it with the additional electron, and then she projects the additional electron onto an orthogonal basis for dividing the N-electron systems into two groups. In the first group, the N parties obtain a subset of N-electron systems in a maximally entangled state directly. In the second group, they obtain some less-entangled N-electron systems, which are the resource for the entanglement concentration in the next round. By iterating the entanglement concentration process several times, the present ECP has the maximal success probability, which is the theoretical limit of an ECP, equal to the entanglement of the partially entangled state, and higher than the others. This ECP may be useful in quantum computers based on electron-spin systems in the future.

关键词： entanglement concentration electron-spin states decoherence quantum communication

Efficient entanglement concentration for arbitrary less-entangled NOON state assisted by single photons

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Chinese Physics B 2016年第2期25卷 98-105页

作者：周澜盛宇波 College of Mathematics and Physics Nanjing University of Posts and Telecommunications Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and Telecommunications Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications

We put forward two efficient entanglement concentration protocols （ECPs） for arbitrary less-entangled NOON state. Both ECPs only require one pair of less-entangled NOON state and an auxiliary photon. In the first ECR the auxiliary photon is shared by two parties, while in the second ECP, the auxiliary photon is only possessed by one party, which can increase the practical success probability by avoiding the transmission loss and simplify the operations. Moreover, both ECPs can be used repeatedly to get a high success probability. Based on the above features, our two ECPs, especially the second one, may be useful in the quantum information processing.

关键词： quantum communication NOON state entanglement concentration cross-Kerr nonlinearity

Hybrid entanglement concentration assisted with single coherent state

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Chinese Physics B 2016年第3期25卷 65-72页

作者：郭锐周澜顾世浦王兴福盛宇波 Key Laboratory of Broadband Wireless Communication and Sensor Network Technology (Ministry of Education) Nanjing University of Posts and Telecommunications College of Mathematics & Physics Nanjing University of Posts and Telecommunications College of Electronic Science and Engineering Nanjing University of Posts and Telecommunications

Hybrid entangled state （HES） is a new type of entanglement, which combines the advantages of an entangled po- larization state and an entangled coherent state. HES is widely discussed in the applications of quantum communication and computation. In this paper, we propose three entanglement concentration protocols （ECPs） for Bell-type HES, W-type HES, and cluster-type HES, respectively. After performing these ECPs, we can obtain the maximally entangled HES with some success probability. All the ECPs exploit the single coherent state to complete the concentration. These protocols are based on the linear optics, which are feasible in future experiments.

关键词： hybrid entangled state quantum communication and computation entanglement concentration

Efficient three-step entanglement concentration for an arbitrary four-photon cluster state

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Chinese Physics B 2013年第3期22卷 137-142页

作者：司斌苏石磊孙立莉程留永王洪福张寿 Department of Physics College of ScienceYanbian University Center for the Condensed-Matter Science and Technology Department of PhysicsHarbin Institute of Technology School of Physics and Optoelectronic Technology Dalian University of Technology

We propose an entanglement concentration protocol to concentrate an arbitrary partially-entangled four-photon cluster *** a pioneering three-step entanglement concentration scheme,our protocol only needs a single-photon resource to assist the concentration in each step,which makes this protocol more *** the help of the linear optical elements and weak cross-Kerr nonlinearity,one can obtain a maximally-entangled cluster state via local operations and classical ***,the protocol can be iterated to obtain a higher success probability and is feasible under current experimental conditions.

关键词： cluster state entanglement concentration cross-Kerr nonlinearity

Efficient electronic entanglement concentration assisted by single mobile electrons

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Chinese Physics B 2013年第11期22卷 178-182页

作者：盛宇波周澜 Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education College of Mathematics & Physics Nanjing University of Posts and Telecommunications

We present an efficient entanglement concentration protocol （ECP） for mobile electrons with charge detection. This protocol is quite different from other ECPs for one can obtain a maximally entangled pair from a pair of less-entangled state and a single mobile electron with a certain probability. With the help of charge detection, it can be repeated to reach a higher success probability. It also does not need to know the coefficient of the original less-entangled states. All these advantages may make this protocol useful in current distributed quantum information processing.

关键词： quantum communication entanglement entanglement concentration

Consequent entanglement concentration of a less-entangled electronic cluster state with controlled-not gates

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Chinese Physics B 2014年第5期23卷 91-95页

作者：周澜 College of Mathematics & Physics Nanjing University of Posts and Telecommunications Key Laboratory of Broadband Wireless Communication and Sensor Network Technology of the Ministry of Education Nanjing University of Posts and Telecommunications

We present a highly efficient entanglement concentration protocol （ECP） for a four-electron system in a less-entangled cluster state. In this ECP, we only require one pair of less-entangled electron cluster states and one ancillary electron to complete the task. With the help of the controlled-not （CNOT） gate, the concentrated maximally entangled state can be retained for further application with some success probability. On the other hand, the discarded items can be reused to obtain a high success probability. All the features make this ECP useful in the current quantum information field.

关键词： quantum communication entanglement entanglement concentration

Optimal entanglement concentration for three-photon W states with parity check measurement

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Chinese Physics B 2013年第2期22卷 97-104页

作者：周澜盛宇波赵生妹 College of Mathematics & Physics Nanjing University of Posts and Telecommunications Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education National Laboratory of Solid State Microstructures Nanjing University

We present an efficient entanglement concentration protocol（ECP） for the less-entangled W state with some identical conventional polarized single *** the protocol,two of the parties say Alice and Charlie should perform the parity check measurements and they can ultimately obtain the maximally entangled W state with a certain success ***,they can obtain another less-entangled W state,which can be reconcentrated into the maximally entangled W *** iterating this ECP,a high success probability can be *** ECP may be an optimal one and it is useful in current quantum information processing.

关键词： quantum communication entanglement entanglement concentration