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Loss resilience for two-qubit state transmission using distributed phase sensitive amplification.

James M Dailey1, Anjali Agarwal1, Paul Toliver1

  • 1Applied Communication Sciences, 331 Newman Springs Road, Red Bank, New Jersey 07701, USA.

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|November 13, 2015
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Summary
This summary is machine-generated.

We transmitted quantum states through an optical phase-sensitive amplifier, preserving their quality despite transmission loss. This method uses a novel two-qubit encoding to reduce loss effects in quantum communication.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Telecommunications

Background:

  • Quantum information is vulnerable to channel loss, degrading qubit quality.
  • Optical Phase-Sensitive Amplifiers (OPSA) offer potential for quantum state preservation.
  • Non-orthogonal quantum states pose challenges for amplification and transmission.

Purpose of the Study:

  • To investigate the transmission of phase-encoded non-orthogonal quantum states through a fiber-based OPSA.
  • To assess the effectiveness of OPSA in preserving quantum state quality against transmission loss.
  • To explore a new quantum encoding strategy that leverages OPSA characteristics.

Main Methods:

  • Utilized telecom-wavelength photonic qubit pairs for quantum state encoding.
  • Employed a 5-km long fiber-based distributed OPSA.
  • Set OPSA gain equal to transmission loss for probabilistic state preservation.
  • Transmitted phase-encoded non-orthogonal quantum states through the OPSA system.

Main Results:

  • Successfully transmitted quantum states through the 5-km OPSA.
  • Achieved probabilistic preservation of input quantum states.
  • Demonstrated equal amplification for non-optimally aligned states.
  • Observed no measurable degradation in quantum state quality post-transmission.

Conclusions:

  • OPSA can probabilistically preserve non-orthogonal quantum states during fiber transmission.
  • A two-qubit Hilbert space encoding benefits from OPSA, mitigating loss effects.
  • This approach offers a promising method for robust quantum communication over lossy channels.