Nearly deterministic Bell measurement with multiphoton entanglement for efficient quantum-information processing

Seung-Woo Lee, Kimin Park, Timothy C. Ralph, and Hyunseok Jeong
Phys. Rev. A 92, 052324 – Published 19 November 2015

Abstract

We present a detailed analysis of the Bell measurement scheme proposed in Lee et al. [Phys. Rev. Lett. 114, 113603 (2015)] based on a logical qubit using Greenberger-Horne-Zeilinger entanglement of photons. The success probability of the proposed Bell measurement can be made arbitrarily high using only linear optics as the number of photons in a logical qubit increases. We compare our scheme with all the other proposals, using single-photon qubits, coherent-state qubits, or hybrid qubits, suggested to enhance the efficiency of the Bell measurement. As a remarkable advantage, our scheme requires only photon on-off measurements, while photon number resolving detectors are necessary for all the other proposals. We find that the scheme based on coherent-state qubits shows the best performance with respect to the attained success probability in terms of the average number of photons used in the process, while our scheme outperforms the schemes using single-photon qubits. We finally show that efficient quantum communication and fault-tolerant quantum computation can be realized using our approach.

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  • Received 21 July 2015

DOI:https://doi.org/10.1103/PhysRevA.92.052324

©2015 American Physical Society

Authors & Affiliations

Seung-Woo Lee1, Kimin Park1,2, Timothy C. Ralph3, and Hyunseok Jeong1

  • 1Center for Macroscopic Quantum Control, Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea
  • 2Department of Optics, Palacký University, 17. listopadu 1192/12, 77146 Olomouc, Czech Republic
  • 3Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, University of Queensland, St Lucia, Queensland 4072, Australia

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Issue

Vol. 92, Iss. 5 — November 2015

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