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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Synchronization of optical photons for quantum information processing.

Kenzo Makino1, Yosuke Hashimoto1, Jun-Ichi Yoshikawa1

  • 1Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Science Advances
|July 8, 2016
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate Hong-Ou-Mandel interference with two synchronized, pure optical photons using quantum memories. This advances quantum information processing by controlling photon arrival times and maintaining high purity for photonic qubits.

Keywords:
Hong-Ou-Mandel effectQuantum information processingWigner functionconcatenated cavityhomodyne measurementparametric down conversionquantum memoryquantum opticsquantum state tomographysingle photon

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Photonic Quantum Technologies

Background:

  • The Hong-Ou-Mandel (HOM) effect is crucial for quantum information processing with photonic qubits.
  • Complex interferometric networks require synchronized photon arrival times and high photon purity.
  • Recent advances in single-photon storage with high purity enable new quantum experiments.

Purpose of the Study:

  • To demonstrate HOM interference between two heralded, nearly pure optical photons.
  • To achieve synchronization of photons using independent quantum memories.
  • To validate the purity of stored photons for quantum interference.

Main Methods:

  • Utilizing two independent quantum memories to store and synchronize heralded optical photons.
  • Implementing controlled storage times up to 1.8 μs.
  • Performing homodyne measurements to confirm photon purity via a negative Wigner function.

Main Results:

  • Successful demonstration of HOM interference for the first time with synchronized, nearly pure optical photons.
  • Achieved controlled storage times of up to 1.8 μs.
  • Confirmed sufficiently high photon purities, evidenced by a negative Wigner function.

Conclusions:

  • Quantum memories can effectively synchronize photonic qubits while maintaining high purity.
  • This technique is a significant step towards building complex photonic interferometric networks for quantum information processing.
  • The demonstrated method paves the way for scalable quantum computing and communication systems.