Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

ACTA PHOTONICA SINICA

Entanglement Concentration of Single-photon Entangled States

蔡新华 Cai Xin-hua, 乔闹生 Qiao Naosheng, 彭光含 Peng Guang-han

Published Jan 1, 2010• 1 citation
Publisher

Abstract

By the analysis of the action characteristic of the beam-splitter,presenting a method of generating the single-photon entangled states utilizing optics beam-splitter and single-photon source.A scheme on entanglement concentration of the single-photon entanglement states is designed.In this scheme,the two single-photon partially entangled states are utilized as the quantum channel.The process of the entanglement concentration is achieved by using the 50/50 symmetric beam splitters,the photon detectors and with the help of classical information. Results show that to distill some maximally entangled states from partially entangled pure states is possible by using this method.

DOI
10.3788/gzxb20103901.0153

Related papers

Entanglement Concentration of Entangled Coherent States

蔡新华 Cai Xin-hua, 彭光含 Peng Guang-han, 乔闹生 Qiao Naosheng

With linear optical components to manipulate quantum states of optical fields,the quantum entanglement control and quantum communication can be implemented remotely.By analyzing optical splitter and its use of coherent states,it was found that when the initial state was a direct product of two partially entangled coherent states;another two modes would collapse to a new entangled state using optical splitter and photon-detectors on two modes.Based on this feature,the scheme on entanglement concentration was presented.In this scheme,the two partially entangled coherent states were utilized as the quantum channel,when zero photon and odd photons were detected in two modes separately,and another two modes would collapse to the maximum entangled state,thereby completing the process of the entanglement concentration.It was proved that,no matter how small the initial entanglement is,to distill some maximally entangled states from partially entangled pure states is possible.

ACTA PHOTONICA SINICA•Jan 1, 2011•0 citations

Entanglement Diversion of Entangled Squeezed Vacuum State

Naosheng Qiao

By analyzing the action of a beam splitter on squeezed vacuum states (SVSs), it is found that, if the two input light beams of the beam splitter have the same squeezing amplitude and phase, the output state is a two-mode SVS. If the two input light beams of the beam splitter have the same squeezing amplitude but a phase difference of π, the output state is a direct product state of two single-mode SVSs. In the two-mode SVS, each mode has the same photon number with both even and odd photons, while the single-mode SVS which contains only even-number photon in the photon number-state representation. Based on these results, a scheme to divert the entanglement of entangled SVS from its initial locations to another location is suggested. In this scheme, the two SVSs are utilized as the quantum channel. The process of the entanglement diversion is achieved by using the 50/50 symmetric beam splitters and the photon detectors with the help of classical information.

ACTA PHOTONICA SINICA•Jan 1, 2008•0 citations

Single-photon-assisted entanglement concentration of partially entangled multiphoton W states with linear optics

Bin Gu

We propose a single-photon-assisted entanglement concentration protocol (ECP) for nonlocal N-photon systems in a partially entangled pure W-class state with linear optical elements. Only one of the N parties in quantum communication prepares an ancillary photon and operates the entanglement concentration process for picking up the standard N-photon W state from each partially entangled pure W-class state by choosing the two-mode instances from a polarization beam splitter. Compared with other ECPs for W-class states, our protocol has some advantages. First, it requires only linear optical elements. Second, it requires an N-photon system and an ancillary photon for each round of concentration, not two systems. Third, only one party asks other parties to retain or discard their photons. All these advantages make our ECP more feasible and more convenient than others.

Journal of the Optical Society of America B•Jun 19, 2012•54 citations

Concentrating partial entanglement of two photons via entanglement swapping

Myung-Joong Hwang, Yoon-Ho Kim

We report an entanglement concentration scheme in which a maximally entangled Bell-state can be obtained from two pairs of partially (or non-maximally) entangled photons. Since this scheme is built only upon linear optics and does not require photon-number resolving detectors, it should be applicable in experimental implementations of various quantum information protocols which require maximally entangled Bell-states.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Aug 31, 2006•1 citation

Efficient single-photon-assisted entanglement concentration for partially entangled photon pairs

Yu‐Bo Sheng, Lan Zhou, Shengmei Zhao +1 more

We present two realistic entanglement concentration protocols (ECPs) for pure partially entangled photons. A partially entangled photon pair can be concentrated to a maximally entangled pair with only an ancillary single photon with a certain probability, while the conventional ECPs require two copies of partially entangled pairs at least. Our first protocol is implemented with linear optics and the second protocol is implemented with cross-Kerr-nonlinearities. Compared with other ECPs, they do not need to know the accurate coefficients of the initial state. With linear optics, it is feasible with current experiments. With cross-Kerr-nonlinearities, it does not require sophisticated single-photon detectors and can be repeated to get a higher success probability. Moreover, the second protocol can get the higher entanglement transformation efficiency and it may be the most economical protocol by far. Meanwhile, both protocols are more suitable for multiphoton system concentration because they need less operations and classical communications. All these advantages make the two protocols useful in current long-distance quantum communications.

arXiv:1202.2190•Physical Review A•Jan 4, 2012•258 citations

Beam splitter entangler for light fields

Xun‐Li Feng, Ruxin Li, Zhizhan Xu

We propose an experimentally feasible scheme to generate various types of entangled states of light fields by using beam splitters and single-photon detectors. Two beams of light fields are incident on two beam splitters respectively with each beam being asymmetrically split into two parts in which one part is supposed to be so weak that it contains at most one photon. We let the two weak output modes interfere at a third beam splitter. A conditional joint measurement on both weak output modes may result in an entanglement between the other two output modes. The conditions for the maximal entanglement are discussed based on the concurrence. Several specific examples are also examined.

arXiv:quant-ph/0306027•Physical Review A•Mar 23, 2005•12 citations
By the analysis of the action characteristic of the beam-splitter,presenting a method of generating the single-photon entangled states utilizing optics beam-splitter and single-photon source.A scheme on entanglement concentration of the single-photon entanglement states is designed.In this scheme,the two single-photon partially entangled states are utilized as the quantum channel.The process of the entanglement concentration is achieved by using the 50/50 symmetric beam splitters,the photon detectors and with the help of classical information. Results show that to distill some maximally entangled states from partially entangled pure states is possible by using this method.
With linear optical components to manipulate quantum states of optical fields,the quantum entanglement control and quantum communication can be implemented remotely.By analyzing optical splitter and its use of coherent states,it was found that when the initial state was a direct product of two partially entangled coherent states;another two modes would collapse to a new entangled state using optical splitter and photon-detectors on two modes.Based on this feature,the scheme on entanglement concentration was presented.In this scheme,the two partially entangled coherent states were utilized as the quantum channel,when zero photon and odd photons were detected in two modes separately,and another two modes would collapse to the maximum entangled state,thereby completing the process of the entanglement concentration.It was proved that,no matter how small the initial entanglement is,to distill some maximally entangled states from partially entangled pure states is possible.
By analyzing the action of a beam splitter on squeezed vacuum states (SVSs), it is found that, if the two input light beams of the beam splitter have the same squeezing amplitude and phase, the output state is a two-mode SVS. If the two input light beams of the beam splitter have the same squeezing amplitude but a phase difference of π, the output state is a direct product state of two single-mode SVSs. In the two-mode SVS, each mode has the same photon number with both even and odd photons, while the single-mode SVS which contains only even-number photon in the photon number-state representation. Based on these results, a scheme to divert the entanglement of entangled SVS from its initial locations to another location is suggested. In this scheme, the two SVSs are utilized as the quantum channel. The process of the entanglement diversion is achieved by using the 50/50 symmetric beam splitters and the photon detectors with the help of classical information.
We propose a single-photon-assisted entanglement concentration protocol (ECP) for nonlocal N-photon systems in a partially entangled pure W-class state with linear optical elements. Only one of the N parties in quantum communication prepares an ancillary photon and operates the entanglement concentration process for picking up the standard N-photon W state from each partially entangled pure W-class state by choosing the two-mode instances from a polarization beam splitter. Compared with other ECPs for W-class states, our protocol has some advantages. First, it requires only linear optical elements. Second, it requires an N-photon system and an ancillary photon for each round of concentration, not two systems. Third, only one party asks other parties to retain or discard their photons. All these advantages make our ECP more feasible and more convenient than others.
We present two realistic entanglement concentration protocols (ECPs) for pure partially entangled photons. A partially entangled photon pair can be concentrated to a maximally entangled pair with only an ancillary single photon with a certain probability, while the conventional ECPs require two copies of partially entangled pairs at least. Our first protocol is implemented with linear optics and the second protocol is implemented with cross-Kerr-nonlinearities. Compared with other ECPs, they do not need to know the accurate coefficients of the initial state. With linear optics, it is feasible with current experiments. With cross-Kerr-nonlinearities, it does not require sophisticated single-photon detectors and can be repeated to get a higher success probability. Moreover, the second protocol can get the higher entanglement transformation efficiency and it may be the most economical protocol by far. Meanwhile, both protocols are more suitable for multiphoton system concentration because they need less operations and classical communications. All these advantages make the two protocols useful in current long-distance quantum communications.
We propose an experimentally feasible scheme to generate various types of entangled states of light fields by using beam splitters and single-photon detectors. Two beams of light fields are incident on two beam splitters respectively with each beam being asymmetrically split into two parts in which one part is supposed to be so weak that it contains at most one photon. We let the two weak output modes interfere at a third beam splitter. A conditional joint measurement on both weak output modes may result in an entanglement between the other two output modes. The conditions for the maximal entanglement are discussed based on the concurrence. Several specific examples are also examined.