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Balanced, gated-mode photon detector for quantum-bit discrimination at 1550 nm
Optics Letters
|November 23, 2007
Summary
This study demonstrates a new photon detector using two avalanche photodiodes (APDs) for quantum bit discrimination. The balanced output design cancels noise spikes, improving performance for quantum technologies.
Area of Science:
- Quantum optics
- Photon detection
Background:
- Quantum-bit discrimination requires sensitive photon detectors.
- Avalanche photodiodes (APDs) are crucial for detecting single photons.
- Noise spikes in APDs can hinder precise quantum measurements.
Purpose of the Study:
- To demonstrate a novel photon detector for quantum-bit discrimination.
- To improve the performance of avalanche photodiodes (APDs) by reducing noise.
- To enable lower operating voltages for discriminators.
Main Methods:
- Combining two avalanche photodiodes (APDs) in a balanced output configuration.
- Utilizing a gated mode for photon detection at 1550 nm.
- Analyzing dark count and afterpulse probabilities.
Main Results:
- Successful cancellation of noise spikes using balanced APD output.
- Reduced dark count probability to 7x10⁻⁷ and afterpulse probability to 7x10⁻⁴.
- Maintained a detection efficiency of 11% at 178 K without performance degradation.
Conclusions:
- The demonstrated dual-APD photon detector effectively discriminates quantum bits.
- Spike cancellation allows for reduced discriminator thresholds and gate pulse voltages.
- This technology offers improved performance for quantum applications at cryogenic temperatures.
