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Area of Science:

Quantum Optics
Spectroscopy
Quantum Information Science

Background:

Single-shot high-resolution spectroscopy at the single photon-level is crucial for advanced quantum technologies.
Frequency-multiplexed quantum repeaters require precise spectroscopic measurements for efficient operation.

Purpose of the Study:

To propose and demonstrate a novel single-shot high-resolution single-photon spectroscopy system.
To enable enhanced multiplexing capabilities in quantum repeater schemes.

Main Methods:

Integration of a virtually imaged phased-array (VIPA) for high-resolution frequency-to-spatial mode mapping.
Utilization of a single-photon avalanche diode (SPAD) array for high-precision spatial mode detection.
Experimental demonstration using weak coherent pulses with a 120 MHz frequency mode interval.

Main Results:

Successful demonstration of the proposed single-shot high-resolution single-photon spectroscopy system.
Achieved frequency mode interval of 120 MHz, matching quantum memory requirements.
Validated the system's principle for potential quantum repeater applications.

Conclusions:

The developed spectroscopy system offers a promising approach for advancing quantum repeater technology.
Maximizing multiplexing capability in frequency-multiplexed quantum repeaters is achievable with this system.
The system's performance aligns with the needs of atomic frequency comb quantum memories.