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Radiophysics and Quantum Electronics

SINGLE-CAVITY PARAMETRIC PHOTONS GENERATOR COMPATIBLE WITH SOLID-STATE QUANTUM MEMORIES

D. A. Turaykhanov, A. O. Akat’ev, É. I. Ikhsanova, Латыпов Ильнур Зиннурович, A. V. Shkalikov, А. А. Калачев

Published Apr 1, 2023• 1 citation
Publisher
DOI
10.52452/00213462_2023_66_04_300

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arXiv:quant-ph/0410074•Oct 1, 2005•3 citations
In this paper, we describe how introducing angular dispersion into the pump beam and the downconverted photons in spontaneous parametric downconversion allows us to manipulate the joint spectrum of the paired photons. In particular, when collinear geometries are used, we demonstrate an increase of the photons' bandwidth and discuss the implications of this method for the generation of narrow temporal Fourier transform limited biphotons. Additionally, we describe the situation in which angular dispersion is combined with noncollinear geometries. In this case, a full control of the joint spectrum is achieved and heralded pure single photons with controllable bandwidth can be obtained.
A scheme of three-particle entanglement purification is presented in this work. The physical system undertaken for investigation is dot-like single quantum well excitons independently coupled through a single microcavity mode. The theoretical framework for the proposed scheme is based on the quantum jump approach for analyzing the progress of the trible-exciton entanglement as a series of conditional measurement has been taken on the cavity field state. We first investigate how cavity photon affects the purity of the double-exciton state and the purification efficiency in two-particle protocol. Then we extend the two-particle case and conclude that the three-exciton state can be purified into W state, which involves the one-photon-trapping phenomenon, with a high yield. Finally, an achievable setup for purification using only modest and presently feasible technologies is also proposed.