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

Chinese Journal of Quantum Electronics

Atomic Bell state and GHZ state analyzers based on cavity input-output processes

LI Ai-l

Published Jan 1, 2014• 0 citations
OpenAlex

Abstract

Non-destructive identification of entanglement is very important in quantum information processing.A scheme is proposed which constructs a controlled phase shifter(CPS) gate via the cavity input-output process.The CPS gate can be used to construct a parity analyzer(PA) with homodyne detection technology.Moreover,it uses the PAs,combined with some other operations,to construct the non-destructive atomic Bell state and GHZ state analyzers.The scheme has two advantages.It uses the coherent light and homodyne detection,which are much easier to be implemented than single photon source and single photon detection.The atomic Bell state and GHZ state analyzers constructed are non-destructive.All the methods and techniques used in this scheme are achievable in the present experiment.

Related papers

Nondestructive N-atom Greenberger–Horne–Zeilinger state analyzer via the cavity input–output process

Long Zhu, Hong‐Fu Wang, Shi‐Lei Su +3 more

We propose a deterministic scheme to realize N-atom Greenberger–Horne–Zeilinger (GHZ) state analyzer based on the cavity input–output process. In the scheme, we construct a two-qubit parity analyzer and a GHZ-state phase analyzer and show that all the N-atom GHZ states can be completely identified in a nondestructive way by combining these two kinds of analyzers. The fidelities of our analyzers are also calculated, which show that our scheme has a high performance in theory. The scheme opens promising perspectives for achieving efficient large-scale quantum communication and quantum information processing networks.

Journal of the Optical Society of America B•Jul 26, 2012•3 citations

Quantum entanglement distribution with hybrid parity gate

Feng Mei, Ya‐Fei Yu, Xun‐Li Feng +2 more

We propose a scheme for entanglement distribution among different single atoms trapped in separated cavities. In our scheme, by reflecting an input coherent optical pulse from a cavity with a single trapped atom, a controlled phase-shift gate between the atom and the coherent optical pulse is achieved. Based on this gate and homodyne detection, we construct an $n$-qubit parity gate and show its use for the distribution of a large class of entangled states in one shot, including the GHZ state $|{\mathrm{GHZ}}_{n}\ensuremath{\rangle}$, $W$ state $|{W}_{n}\ensuremath{\rangle}$, Dicke state $|{D}_{n,k}\ensuremath{\rangle}$, and certain sums of Dicke states $|{G}_{n,k}\ensuremath{\rangle}$. We also show that such a distribution could be performed with high success probability and high fidelity even in the presence of channel loss.

arXiv:1902.08344•Physical Review A•Nov 16, 2010•34 citations

Preparation of Entanglement of Atoms and of Photons via Cavity Input–Output Process

Zhou Yan-Li, Yang Li-Jia, Hong‐Yi Dai +1 more

We propose a method to prepare multipartite entangled states such as cluster states and graph states based on the cavity input–output process and single photon measurement. Two quantum gates, a controlled phase gate and a fusion gate between two atoms trapped in respective cavities, are proposed to prepare atomic cluster states and graph states with one and two dimensions. We also introduce a scheme that can generate an arbitrary multipartite photon cluster state which uses two coherent states as a qubit basis.

Chinese Physics Letters•Jun 1, 2009•5 citations

Entanglement Purification Through Cavity Input-Output Process

Xiaolong Zhang, Feng Mang, Gao Ke-Lin

We propose a scheme to purify entanglement of two atoms from not-too-impure entangled states by checking the parity of the two atoms through the cavity input-output process. As the parity check is made by measurement on single-photon polarization, which would not affect the entanglement of the two atoms, our scheme has the successful probability double of that in a previous well-known scheme with linear optical elements [Nature (London) 410 (2001) 1067], and is insensitive to the photon loss and the detection inefficiency. Experimental feasibility of our scheme with current technology is discussed.

Communications in Theoretical Physics•Aug 1, 2008•2 citations

Atomic entanglement purification and concentration using coherent state input-output process in low-Q cavity QED regime

Cong Cao, Chuan Xi Wang, Lingyan He +1 more

We investigate an atomic entanglement purification protocol based on the coherent state input-output process by working in low-Q cavity in the atom-cavity intermediate coupling region. The information of entangled states are encoded in three-level configured single atoms confined in separated one-side optical micro-cavities. Using the coherent state input-output process, we design a two-qubit parity check module (PCM), which allows the quantum nondemolition measurement for the atomic qubits, and show its use for remote parities to distill a high-fidelity atomic entangled ensemble from an initial mixed state ensemble nonlocally. The proposed scheme can further be used for unknown atomic states entanglement concentration. Also by exploiting the PCM, we describe a modified scheme for atomic entanglement concentration by introducing ancillary single atoms. As the coherent state input-output process is robust and scalable in realistic applications, and the detection in the PCM is based on the intensity of outgoing coherent state, the present protocols may be widely used in large-scaled and solid-based quantum repeater and quantum information processing.

Optics Express•Feb 11, 2013•81 citations

Implementation of photon Bell-state and GHZ-state analyzers through the Faraday rotation

Gu Yong-Jian, Xiaodong Chen, Xiu‐Min Lin +1 more

The schemes are presented for realizing optical Bell-state and GHZ-state analyzers through the Faraday rotation, which results from polarization photon reflected by optical cavity with trapped atom. They can be extended to the case of completely distinguishing photon Bell-state and GHZ-state without destroying quantum qubit. In the schemes, strong-coupling condition is not needed and the analyzers can be implemented in low-Q cavity, which further lower the diffculty in experiment.

Acta Physica Sinica•Jan 1, 2010•3 citations
Non-destructive identification of entanglement is very important in quantum information processing.A scheme is proposed which constructs a controlled phase shifter(CPS) gate via the cavity input-output process.The CPS gate can be used to construct a parity analyzer(PA) with homodyne detection technology.Moreover,it uses the PAs,combined with some other operations,to construct the non-destructive atomic Bell state and GHZ state analyzers.The scheme has two advantages.It uses the coherent light and homodyne detection,which are much easier to be implemented than single photon source and single photon detection.The atomic Bell state and GHZ state analyzers constructed are non-destructive.All the methods and techniques used in this scheme are achievable in the present experiment.
We propose a deterministic scheme to realize N-atom Greenberger–Horne–Zeilinger (GHZ) state analyzer based on the cavity input–output process. In the scheme, we construct a two-qubit parity analyzer and a GHZ-state phase analyzer and show that all the N-atom GHZ states can be completely identified in a nondestructive way by combining these two kinds of analyzers. The fidelities of our analyzers are also calculated, which show that our scheme has a high performance in theory. The scheme opens promising perspectives for achieving efficient large-scale quantum communication and quantum information processing networks.
We propose a scheme for entanglement distribution among different single atoms trapped in separated cavities. In our scheme, by reflecting an input coherent optical pulse from a cavity with a single trapped atom, a controlled phase-shift gate between the atom and the coherent optical pulse is achieved. Based on this gate and homodyne detection, we construct an nnn-qubit parity gate and show its use for the distribution of a large class of entangled states in one shot, including the GHZ state $|{\mathrm{GHZ}}_{n}\ensuremath{\rangle}$, WWW state $|{W}_{n}\ensuremath{\rangle}$, Dicke state $|{D}_{n,k}\ensuremath{\rangle}$, and certain sums of Dicke states $|{G}_{n,k}\ensuremath{\rangle}$. We also show that such a distribution could be performed with high success probability and high fidelity even in the presence of channel loss.
We propose a method to prepare multipartite entangled states such as cluster states and graph states based on the cavity input–output process and single photon measurement. Two quantum gates, a controlled phase gate and a fusion gate between two atoms trapped in respective cavities, are proposed to prepare atomic cluster states and graph states with one and two dimensions. We also introduce a scheme that can generate an arbitrary multipartite photon cluster state which uses two coherent states as a qubit basis.
We propose a scheme to purify entanglement of two atoms from not-too-impure entangled states by checking the parity of the two atoms through the cavity input-output process. As the parity check is made by measurement on single-photon polarization, which would not affect the entanglement of the two atoms, our scheme has the successful probability double of that in a previous well-known scheme with linear optical elements [Nature (London) 410 (2001) 1067], and is insensitive to the photon loss and the detection inefficiency. Experimental feasibility of our scheme with current technology is discussed.
We investigate an atomic entanglement purification protocol based on the coherent state input-output process by working in low-Q cavity in the atom-cavity intermediate coupling region. The information of entangled states are encoded in three-level configured single atoms confined in separated one-side optical micro-cavities. Using the coherent state input-output process, we design a two-qubit parity check module (PCM), which allows the quantum nondemolition measurement for the atomic qubits, and show its use for remote parities to distill a high-fidelity atomic entangled ensemble from an initial mixed state ensemble nonlocally. The proposed scheme can further be used for unknown atomic states entanglement concentration. Also by exploiting the PCM, we describe a modified scheme for atomic entanglement concentration by introducing ancillary single atoms. As the coherent state input-output process is robust and scalable in realistic applications, and the detection in the PCM is based on the intensity of outgoing coherent state, the present protocols may be widely used in large-scaled and solid-based quantum repeater and quantum information processing.