• Corpus ID: 248811440

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

@inproceedings{Kochi2022EvaluationOF,
  title={Evaluation of Femtosecond Time-bin Qubits Using Frequency Up-conversion Technique},
  author={Yuta Kochi and Sunao Kurimura and Junko Ishi-Hayase},
  year={2022}
}
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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SHOWING 1-10 OF 22 REFERENCES
Coherent ultrafast measurement of time-bin encoded photons.
TLDR
A tomographically complete set of time-bin qubit projective measurements is demonstrated and the fidelity of operations is sufficiently high to violate the Clauser-Horne-Shimony-Holt-Bell inequality by more than 6 standard deviations.
Time-resolved single-photon detection by femtosecond upconversion.
We demonstrate a time-resolved single-photon detection technique based on ultrafast sum-frequency generation, providing femtosecond measurement capability for single photons in photonic quantum…
Fast time-domain measurements on telecom single photons
Direct measurements on the temporal envelope of quantum light are a challenging task and not many examples are known because most classical pulse characterisation methods do not work on the…
Cross time-bin photonic entanglement for quantum key distribution
We report a fully fibered source emitting cross time-bin-entangled photons at 1540 nm from type-II spontaneous parametric down-conversion. Compared to standard time-bin-entanglement realizations, the…
Optimizing up-conversion single-photon detectors for quantum key distribution.
TLDR
Numerical simulation results indicate that the up-conversion SPDs based on periodically poled lithium niobate waveguides can significantly improve the performance of QKD and extend the communication distance longer than 200 km.
High efficiency single photon detection via frequency up-conversion
Abstract We propose a method of single photon detection of infrared (IR) photons at potentially higher efficiencies and lower noise than allowed by traditional IR band avalanche photodiodes (APDs).…
Controllable Photonic Time-Bin Qubits from a Quantum Dot
Photonic time bin qubits are well suited to transmission via optical fibres and waveguide circuits. The states take the form $\frac{1}{\sqrt{2}}(\alpha \ket{0} + e^{i\phi}\beta \ket{1})$, with…
On-Demand Quantum Storage of Photonic Qubits in an On-Chip Waveguide.
TLDR
On-demand storage of time-bin qubits in an on-chip waveguide memory fabricated on the surface of a ^{151}Eu^{3+}:Y_{2}SiO_{5} crystal, utilizing the Stark-modulated atomic frequency comb protocol is reported.
Efficient single-photon counting at 1.55 microm by means of frequency upconversion.
TLDR
Efficient single-photon detection at 1.55 microm by means of sum-frequency mixing with a strong pump with high background counts at strong circulating pump powers due to efficient upconversion of pump-induced fluorescence photons is demonstrated.
1.25  GHz sine wave gating InGaAs/InP single-photon detector with a monolithically integrated readout circuit.
TLDR
This work presents for the first time, to the best of its knowledge, an InGaAs/InP SPD with 1.25 GHz sine wave gating (SWG) using a monolithically integrated readout circuit (MIRC), and describes the functionality and reliability of the MIRC.
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