Temporally and spectrally multiplexed single photon source using quantum feedback control for scalable photonic quantum technologies

TL;DR

This paper proposes a high-efficiency, multiplexed single-photon source using quantum feedback control, aiming to meet the stringent requirements of scalable photonic quantum technologies with minimal loss.

Contribution

It introduces an on-chip, multiplexed photon source with quantum feedback control achieving 99% efficiency and 1% unheralded loss, advancing scalable quantum photonics.

Findings

Estimated on-demand efficiency of 99% with quantum feedback control.

Achieved unheralded loss of around 1% under ideal conditions.

Proposed parallel use of temporal and spectral multiplexing to reduce device complexity.

Abstract

Current proposals for scalable photonic quantum technologies require on-demand sources of indistinguishable single photons with very high efficiency (having unheralded loss below $1\%$). Even with recent progress in the field there is still a significant gap between the requirements and state of the art performance. Here, we propose an on-chip source of multiplexed, heralded photons. Using quantum feedback control on a photon storage cavity with an optimized driving protocol, we estimate an on-demand efficiency of $99\%$ and unheralded loss of order $1\%$, assuming high efficiency detectors and intrinsic cavity quality factors of order $10^8$. We further explain how temporal- and frequency-multiplexing can be used in parallel to significantly reduce device requirements if single photon frequency conversion is possible with efficiency in the same range of $99\%$.