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Journal of the Optical Society of America B

Complete and nondestructive polarization-entangled cluster state analysis assisted by a cavity input–output process

Jili Zhang, Shi‐Lei Su, Shou Zhang, Ai‐Dong Zhu, Hong‐Fu Wang

Published Feb 11, 2016• 5 citations
Publisher

Abstract

We present two schemes to realize four- and five-photon polarization-entangled cluster state analysis. For four- and five-photon polarization cluster states, the complete bases are composed of 16 and 32 orthogonal state vectors, respectively. To distinguish all of these orthogonal bases completely and nondestructively, a parity analyzer, a polarization analyzer, and two cluster state phase analyzers are designed with some simple linear optical elements and auxiliary atoms trapped in cavities. After implementing the nondestructive cluster analysis process, the cluster states are preserved and thus could be used again in other schemes. The investigations of the fidelities show that our schemes are feasible under the current experimental technology. Our proposed schemes may be useful in multiparticle teleportation, quantum dense coding, and other quantum information processing tasks.

DOI
10.1364/josab.33.000342

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We present two schemes to realize four- and five-photon polarization-entangled cluster state analysis. For four- and five-photon polarization cluster states, the complete bases are composed of 16 and 32 orthogonal state vectors, respectively. To distinguish all of these orthogonal bases completely and nondestructively, a parity analyzer, a polarization analyzer, and two cluster state phase analyzers are designed with some simple linear optical elements and auxiliary atoms trapped in cavities. After implementing the nondestructive cluster analysis process, the cluster states are preserved and thus could be used again in other schemes. The investigations of the fidelities show that our schemes are feasible under the current experimental technology. Our proposed schemes may be useful in multiparticle teleportation, quantum dense coding, and other quantum information processing tasks.
We propose a method to construct an optical cluster-state analyzer based on cross-Kerr nonlinearity combined with linear optics elements. In the scheme, we employ two four-qubit parity gates and the controlled phase gate (CPG) from only the cross-Kerr nonlinearity and show that all the orthogonal four-qubit cluster states can be completely identified. The scheme is significant for the large-scale quantum communication and quantum information processing networks. In addition, the scheme is feasible and deterministic under current experimental conditions.
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We propose an efficient protocol for complete polarized photons Bell-states and Greenberger–Horne–Zeilinger (GHZ)-states analysis assisted by atoms. With the help of assistant atoms and some simple liner optical elements, the analysis of both polarization Bell states and GHZ states can be performed completely. In our protocol, the assistant atoms are trapped in cavity quantum electronic dynamics (QED), which is feasible with current experimental technology. Moreover, the polarized photons entangled states will not be destroyed in our protocol. Therefore, our scheme might contribute to the quantum communication, quantum computation, and some other fields in quantum information processing.
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We propose a method to generate multiphoton polarization-entangled cluster states of any number photons by using the fusion operations of two-photon cluster states and a kind of local operation, and then analyze the process of open-destination teleportation of a single photon state using the generated states. Apart from theoretical deductions, we also give the experimentally schematic diagram, which requires only BBOs, Polarization Beam Splitters, half-wave plates, single photon resources as well as some other linear optical elements. The equipment and techniques used here are all feasible under current technology.
Abstract We propose an efficient method to construct an optical four-photon |χ〉 state analyzer via the cross-Kerr nonlinearity combined with linear optical elements. In this protocol, two four-qubit parity-check gates and two controlled phase gates are employed. We show that all the 16 orthogonal four-qubit |χ〉 states can be completely discriminated with our apparatus. The scheme is feasible and realizable with current technology. It may have useful potential applications in quantum information processing which based on |χ〉 state.