Photonic temporal-mode multiplexing by quantum frequency conversion in a dichroic-finesse cavity

TL;DR

This paper proposes a novel method using a dichroic-finesse cavity for highly selective quantum frequency conversion, enabling efficient temporal-mode multiplexing crucial for high-dimensional quantum information processing.

Contribution

It introduces a new approach employing a dichroic-finesse cavity for near-perfect temporal-mode selectivity in quantum frequency conversion, advancing quantum pulse gate technology.

Findings

Achieves near-perfect temporal-mode selectivity in frequency conversion.

Demonstrates potential for high-efficiency quantum pulse gating.

Provides a low-loss integrated-optics platform for quantum information applications.

Abstract

Orthogonal temporal modes (TMs) form a field-orthogonal, continuous-variable degree of freedom that is in principle infinite dimensional, and create a promising resource for quantum information science and technology. The ideal quantum pulse gate (QPG) is a device that multiplexes and demultiplexes temporally orthogonal optical pulses that have the same carrier frequency, spatial mode, and polarization. The QPG is the chief enabling technology for usage of orthogonal temporal modes as a basis for high-dimensional quantum information storage and processing. The greatest hurdle for QPG implementation using nonlinear-optical, parametric processes with time-varying pump or control fields is the limitation on achievable temporal mode selectivity, defined as perfect TM discrimination combined with unity efficiency. We propose the use of pulsed nonlinear frequency conversion in an optical cavity having greatly different finesses for different frequencies to implement a nearly perfectly TM-selective QPG in a low-loss integrated-optics platform.