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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Single microwave-photon detector using an artificial Λ-type three-level system.

Kunihiro Inomata¹, Zhirong Lin¹, Kazuki Koshino²

¹RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Saitama, Japan.

Nature Communications

|July 26, 2016

Summary

This summary is machine-generated.

Researchers developed a novel detector for single microwave photons, achieving high efficiency and low error rates. This breakthrough advances quantum technologies by enabling sensitive detection of weak microwave signals.

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Area of Science:

Quantum Optics
Superconducting Circuits
Quantum Information

Background:

Single-photon detection is crucial for quantum optics experiments.
Detecting single microwave photons is challenging due to their low energy.

Purpose of the Study:

To demonstrate an efficient detector for single microwave photons.
To overcome the challenges in detecting low-energy microwave quanta.

Main Methods:

Implemented an artificial Lambda (Λ) system using a driven superconducting qubit coupled to a microwave resonator.
Utilized Raman transitions induced by signal photons to excite the qubit.
Employed dispersive readout for qubit state detection, producing a 'click' signal.

Main Results:

Achieved a high single-photon detection efficiency of 0.66±0.06.
Recorded a low dark-count probability of 0.014±0.001.
Demonstrated a fast reset time of approximately 400 ns.

Conclusions:

The developed detector enables efficient and reliable single microwave photon detection.
This technology has potential applications in quantum sensing, communication, and information processing.