• Corpus ID: 248811440

Evaluation of Femtosecond Time-bin Qubits Using Frequency Up-conversion Technique

  title={Evaluation of Femtosecond Time-bin Qubits Using Frequency Up-conversion Technique},
  author={Yuta Kochi and Sunao Kurimura and Junko Ishi-Hayase},
Time-bin qubits, in which quantum information is encoded in a single photon at different times ∆ t , are suitable for long-distance transmission via optical fibers. However, detection of time-bin qubits has been limited to the nanosecond range owing to the limited temporal resolution of single-photon detectors. In this study, we developed an up-conversion single-photon detector (UCSPD), using commercial nonlinear crystals of different lengths. By changing the crystal length and pump power, we… 

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