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Biphoton shaping with cascaded entangled-photon sources

Biphoton shaping with cascaded entangled-photon sources
Biphoton shaping with cascaded entangled-photon sources
Quantum entanglement is an integral part of quantum optics and has been exploited in areas such as computation, cryptography and metrology. The entanglement between photons can be present in various degrees of freedom (DOFs), and even the simplest bi-partite systems can occupy a large Hilbert space. Therefore, it is desirable to exploit this multi-dimensional space for various quantum applications by fully controlling the properties of the entangled photons in multiple DOFs. While current entangled-photon sources are capable of generating entanglement in one or more DOFs, there is currently a lack of practical techniques that can shape and control the entanglement properties in multiple DOFs. Here we show that cascading two or more entangled-photon sources with tunable linear media in between allows us to generate photon-pairs whose entanglement properties can be tailored and shaped in the frequency and polarisation domains. We first develop a quantum mechanical model to study the quantum state generated from the cascade structure with special considerations paid to the effects of pump temporal coherence, linear dispersion, and in-structure polarisation transformation applied between the entangled-photon sources. We then experimentally generate photon-pairs with tunable entanglement properties by manipulating the dispersion and birefringence properties of the linear medium placed in between two entangled-photon sources. This is done in an all-fibre, phase stable, and alignment-free configuration. Our results show that the cascade structure offers a great deal of flexibility in tuning the properties of entangled photons in multiple DOFs, opening up a new avenue in engineering quantum light sources.
Riazi, Arash
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Chen, Changjia
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Zhu, Eric Y.
a5837a40-5106-401b-b2a7-f7b421325d02
Gladyshev Alexey, V
379768ce-f0ce-42fb-b641-49ba6080b96c
Kazansky, Peter G.
a5d123ec-8ea8-408c-8963-4a6d921fd76c
Sipe, J. E.
08c32725-d093-44ce-99ec-889cf4c70ee8
Qian, Li
3e26e957-afd2-407a-8fa8-6f15b0f70ea3
Riazi, Arash
e54caeb9-1266-4a98-82a4-d37969c9393f
Chen, Changjia
ab034b72-03b9-4e62-9815-bca04880b116
Zhu, Eric Y.
a5837a40-5106-401b-b2a7-f7b421325d02
Gladyshev Alexey, V
379768ce-f0ce-42fb-b641-49ba6080b96c
Kazansky, Peter G.
a5d123ec-8ea8-408c-8963-4a6d921fd76c
Sipe, J. E.
08c32725-d093-44ce-99ec-889cf4c70ee8
Qian, Li
3e26e957-afd2-407a-8fa8-6f15b0f70ea3

Riazi, Arash, Chen, Changjia, Zhu, Eric Y., Gladyshev Alexey, V, Kazansky, Peter G., Sipe, J. E. and Qian, Li (2019) Biphoton shaping with cascaded entangled-photon sources. npj Quantum Information, 5 (1). (doi:10.1038/s41534-019-0188-1).

Record type: Article

Abstract

Quantum entanglement is an integral part of quantum optics and has been exploited in areas such as computation, cryptography and metrology. The entanglement between photons can be present in various degrees of freedom (DOFs), and even the simplest bi-partite systems can occupy a large Hilbert space. Therefore, it is desirable to exploit this multi-dimensional space for various quantum applications by fully controlling the properties of the entangled photons in multiple DOFs. While current entangled-photon sources are capable of generating entanglement in one or more DOFs, there is currently a lack of practical techniques that can shape and control the entanglement properties in multiple DOFs. Here we show that cascading two or more entangled-photon sources with tunable linear media in between allows us to generate photon-pairs whose entanglement properties can be tailored and shaped in the frequency and polarisation domains. We first develop a quantum mechanical model to study the quantum state generated from the cascade structure with special considerations paid to the effects of pump temporal coherence, linear dispersion, and in-structure polarisation transformation applied between the entangled-photon sources. We then experimentally generate photon-pairs with tunable entanglement properties by manipulating the dispersion and birefringence properties of the linear medium placed in between two entangled-photon sources. This is done in an all-fibre, phase stable, and alignment-free configuration. Our results show that the cascade structure offers a great deal of flexibility in tuning the properties of entangled photons in multiple DOFs, opening up a new avenue in engineering quantum light sources.

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Accepted/In Press date: 12 August 2019
e-pub ahead of print date: 10 September 2019

Identifiers

Local EPrints ID: 441880
URI: http://eprints.soton.ac.uk/id/eprint/441880
PURE UUID: 33dc633e-fa85-4d33-acda-7416fe2b8006

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Date deposited: 01 Jul 2020 16:31
Last modified: 14 Sep 2021 19:46

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Contributors

Author: Arash Riazi
Author: Changjia Chen
Author: Eric Y. Zhu
Author: V Gladyshev Alexey
Author: J. E. Sipe
Author: Li Qian

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