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Two-step complete polarization logic Bell-state analysis.

Yu-Bo Sheng1,2, Lan Zhou2,3

  • 1Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China.

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|August 27, 2015
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Summary
This summary is machine-generated.

This study introduces a new method for analyzing Bell states using logic qubits, crucial for quantum communication. The approach enhances the analysis of concatenated Greenberger-Horne-Zeilinger states, improving quantum information processing.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication Protocols
  • Fundamental Quantum Mechanics

Background:

  • Bell states are vital for quantum mechanics tests and quantum communication.
  • Current Bell-state analysis methods often encode directly into physical qubits.
  • Concatenated Greenberger-Horne-Zeilinger (C-GHZ) states offer robustness in noisy environments.

Purpose of the Study:

  • To present an alternative approach for near-complete logic Bell-state analysis.
  • To analyze the polarized C-GHZ state using two logic qubits.
  • To extend the protocol for arbitrary N-qubit C-GHZ states.

Main Methods:

  • Utilizing a parity-check measurement (PCM) based on cross-Kerr nonlinearity.
  • Implementing a two-step logic Bell-state analysis.
  • Applying the method to polarized C-GHZ states.

Main Results:

  • Demonstrated a two-step protocol for logic Bell-state analysis of C-GHZ states.
  • The method achieves near-complete analysis.
  • The protocol is adaptable for N logic qubits.

Conclusions:

  • The proposed logic Bell-state analysis protocol offers a novel approach for C-GHZ states.
  • This method leverages cross-Kerr nonlinearity for robust quantum state discrimination.
  • The protocol holds potential for future long-distance quantum communication utilizing entangled logic qubits.