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Franson interferometry with a single pulse

Franson interferometry with a single pulse
Franson interferometry with a single pulse

In classical optics, interference occurs between two optical fields when they are indistinguishable from one another. The same holds true in quantum optics, where a particular experiment, the Franson interferometer, involves the interference of a photon pair with a time-delayed version of itself. The canonical version of this interferometer requires that the time delay be much shorter than the coherence length of the pump used to generate the photon pair, so as to guarantee indistinguishability. However, when this time delay is comparable to the coherence length, conventional wisdom suggests that interference visibility degrades significantly. In this work, though, we show that the interference visibility can be restored through judicious temporal post-selection. Utilizing correlated photon pairs generated by a pump whose pulsewidth (460 ps) is shorter than the interferometer’s time delay (500 ps), we are able to observe a fringe visibility of 97.4±4.3%. We believe this new method can be used for the encoding of high-dimensional quantum information in the temporal domain.

nonlinear optics, optical fibers, quantum interference, quantum optics
2095-2759
148-154
Zhu, Eric Y.
a5837a40-5106-401b-b2a7-f7b421325d02
Corbari, Costantino
273904e8-5f90-4110-bc17-3d3f2c27d461
Gladyshev, Alexey V.
f178f1b2-c3fa-4b63-96e8-b6e356218b84
Kazansky, Peter G.
a5d123ec-8ea8-408c-8963-4a6d921fd76c
Qian, Li
3e26e957-afd2-407a-8fa8-6f15b0f70ea3
Zhu, Eric Y.
a5837a40-5106-401b-b2a7-f7b421325d02
Corbari, Costantino
273904e8-5f90-4110-bc17-3d3f2c27d461
Gladyshev, Alexey V.
f178f1b2-c3fa-4b63-96e8-b6e356218b84
Kazansky, Peter G.
a5d123ec-8ea8-408c-8963-4a6d921fd76c
Qian, Li
3e26e957-afd2-407a-8fa8-6f15b0f70ea3

Zhu, Eric Y., Corbari, Costantino, Gladyshev, Alexey V., Kazansky, Peter G. and Qian, Li (2018) Franson interferometry with a single pulse. Frontiers of Optoelectronics, 11 (2), 148-154. (doi:10.1007/s12200-018-0809-x).

Record type: Article

Abstract

In classical optics, interference occurs between two optical fields when they are indistinguishable from one another. The same holds true in quantum optics, where a particular experiment, the Franson interferometer, involves the interference of a photon pair with a time-delayed version of itself. The canonical version of this interferometer requires that the time delay be much shorter than the coherence length of the pump used to generate the photon pair, so as to guarantee indistinguishability. However, when this time delay is comparable to the coherence length, conventional wisdom suggests that interference visibility degrades significantly. In this work, though, we show that the interference visibility can be restored through judicious temporal post-selection. Utilizing correlated photon pairs generated by a pump whose pulsewidth (460 ps) is shorter than the interferometer’s time delay (500 ps), we are able to observe a fringe visibility of 97.4±4.3%. We believe this new method can be used for the encoding of high-dimensional quantum information in the temporal domain.

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More information

Accepted/In Press date: 7 May 2018
e-pub ahead of print date: 27 June 2018
Published date: June 2018
Keywords: nonlinear optics, optical fibers, quantum interference, quantum optics

Identifiers

Local EPrints ID: 424808
URI: http://eprints.soton.ac.uk/id/eprint/424808
ISSN: 2095-2759
PURE UUID: 69a7ee38-477c-4684-9b2a-e4d1aecb5781

Catalogue record

Date deposited: 05 Oct 2018 11:47
Last modified: 07 Oct 2020 00:13

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Contributors

Author: Eric Y. Zhu
Author: Costantino Corbari
Author: Alexey V. Gladyshev
Author: Li Qian

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