Towards waveshape-insensitive flying qubit gates

authored by
I. Babushkin, U. Morgner, A. Demircan
Abstract

Temporal/spectral waveshapes of photons involved in gate operation are absolutely crucial for the gate operation. In particular, if we consider linear logic approaches [1] the photons in different channels should be un-correlated and indistinguishable [2] , [3]. The waveshape is also important for so called coherent photon conversion (CPC) proposed in [4]. It uses four wave mixing (FWM) between single-photons in presence of a strong coherent field. For instance, two photons in the distinct modes which we call here signal s and idler i (see Fig. 1a ) can be converted into a pump p photon and then back, demonstrating Rabi-like oscillations; after each oscillation, the phase of the wavepacket is shifted by π , leading to a nonlinear sign (NS) gate functionality. However, since only time-coincident ( t i = t s ) parts of the two-photon wavepacket interact, almost any waveshape leads to a non-ideal gate operation [5]. This problem was elegantly solved in [6] where the signal and idler are assumed to propagate through each other with nonzero velocity (see Fig. 1a ), and interaction of independent photons was demonstrated.

Organisation(s)
Institute of Quantum Optics
PhoenixD: Photonics, Optics, and Engineering - Innovation Across Disciplines
Type
Conference contribution
Publication date
2021
Publication status
Published
Peer reviewed
Yes
ASJC Scopus subject areas
Electronic, Optical and Magnetic Materials, Atomic and Molecular Physics, and Optics
Electronic version(s)
https://doi.org/10.1109/CLEO/Europe-EQEC52157.2021.9542122 (Access: Closed)