Quantum interferences and gates with emitter-based coherent photon
sources
- URL: http://arxiv.org/abs/2401.01187v2
- Date: Tue, 20 Feb 2024 15:28:34 GMT
- Title: Quantum interferences and gates with emitter-based coherent photon
sources
- Authors: I. Maillette de Buy Wenniger, S. C. Wein, D. Fioretto, S. E. Thomas,
C. Ant\'on-Solanas, A. Lema\^itre, I. Sagnes, A. Harouri, N. Belabas, N.
Somaschi, P. Hilaire, J. Senellart, P. Senellart
- Abstract summary: Quantum emitters, such as atoms, defects in crystals, or quantum dots, are excellent sources of indistinguishable single-photons for quantum technologies.
Upon coherent excitation, the emitted photonic state includes a vacuum component in a quantum superposition with the one-photon component.
Here we experimentally and theoretically study how the presence of photon-number coherence alters the foundation of photon-photon gates.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Quantum emitters, such as atoms, defects in crystals, or quantum dots, are
excellent sources of indistinguishable single-photons for quantum technologies.
Upon coherent excitation, however, the emitted photonic state includes a vacuum
component in a quantum superposition with the one-photon component. This
feature has so far been largely disregarded in the framework of linear optical
computing. Here we experimentally and theoretically study how the presence of
photon-number coherence alters the foundation of photon-photon gates: the
Hong-Ou-Mandel interference. We show that the presence of vacuum coherence not
only introduces errors to standard photon indistinguishability measurements,
but also results in complex quantum interference phenomena. These phenomena
lead to additional entanglement that has profound impact on linear computing
schemes, as we illustrate by simulating a heralded gate. Our work reveals the
rich physics arising from photon-number coherence, which holds the potential to
become an asset in future quantum protocols.
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