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

Abstract

Photonic 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.

Controlled-Phase Gate Using Dynamically Coupled Cavities and Optical Nonlinearities

“…Photons are then stored in mode b, which is decoupled from the waveguide, and subsequent control fields release them through mode a. A similar cavity configuration was recently proposed to separate temporal modes of propagating pulses [11].…”

Controlled-phase gate by dynamic coupling of photons to a two-level emitter

“…The scheme for dynamic cavity coupling originating from nonlinear mode interactions used here and in recent work 3,[50][51][52] is compatible with a very small dipole interaction volume of the cavity mode interacting with the TLE. The control pump power may be increased to achieve the required strength of Λ(t) as long as the overlap between the participating modes is large enough to ensure a reasonable nonlinear interaction volume.…”

Does entanglement enhance single-molecule pulsed biphoton spectroscopy?

“…The second term NQ(σ I ) can, in general, be attained by measuring (idler) projectors corresponding to the eigenvectors of the SLD for σ I . A practical setup that can implement approximately optimal single-photon projectors as mode-resolved photon counting may be achieved using quantum pulse gating (QPG) techniques [53][54][55][56][57][58] for ultrafast pulses. This involves an incoherent train of pulses coupling with a sufficiently shaped gating pulse in a sum-frequency interaction inside a nonlinear crystal.…”