Tunable generation of entangled photons in a nonlinear directional coupler

Setzpfandt, F; Solntsev, AS; Titchener, J; Wu, CW; Xiong, C; Schiek, R; Pertsch, T; Neshev, DN; Sukhorukov, AA

Tunable generation of entangled photons in a nonlinear directional coupler

Setzpfandt, F Solntsev, AS

Titchener, J Wu, CW Xiong, C Schiek, R Pertsch, T Neshev, DN Sukhorukov, AA

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Publication Type:: Journal Article
Citation:: Laser and Photonics Reviews, 2016, 10 (1), pp. 131 - 136
Issue Date:: 2016-01-01

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Field	Value	Language
dc.contributor.author	Setzpfandt, F	en_US
dc.contributor.author	Solntsev, AS https://orcid.org/0000-0003-4981-9730	en_US
dc.contributor.author	Titchener, J	en_US
dc.contributor.author	Wu, CW	en_US
dc.contributor.author	Xiong, C	en_US
dc.contributor.author	Schiek, R	en_US
dc.contributor.author	Pertsch, T	en_US
dc.contributor.author	Neshev, DN	en_US
dc.contributor.author	Sukhorukov, AA	en_US
dc.date.issued	2016-01-01	en_US
dc.identifier.citation	Laser and Photonics Reviews, 2016, 10 (1), pp. 131 - 136	en_US
dc.identifier.issn	1863-8880	en_US
dc.identifier.uri	http://hdl.handle.net/10453/112158
dc.description.abstract	© 2016 WILEY-VCH Verlag GmbH & Co. KGaA. The on-chip integration of quantum light sources has enabled the realization of complex quantum photonic circuits. However, for the practical implementation of such circuits in quantum information applications, it is crucial to develop sources delivering entangled quantum photon states with on-demand tunability. Here we propose and experimentally demonstrate the concept of a widely tunable quantum light source based on spontaneous parametric down-conversion in a simple nonlinear directional coupler. We show that spatial photon-pair correlations and entanglement can be reconfigured on-demand by tuning the phase difference between the pump beams and the phase mismatch inside the structure. We experimentally demonstrate the generation of split states, robust N00N states, various intermediate regimes and biphoton steering on a single chip. Furthermore we theoretically investigate other regimes allowing all-optically tunable generation of all Bell states and flexible control of path-energy entanglement. Such wide-range capabilities of a structure comprised of just two coupled nonlinear waveguides are attributed to the intricate interplay between linear coupling and nonlinear phase matching. This scheme provides an important advance towards the realization of reconfigurable quantum circuitry. An integrated all-optically tunable source of two-photon quantum states based on spontaneous parametric down-conversion is experimentally demonstrated in a directional coupler consisting of two lithium niobate waveguides. The degree of entanglement and shape of two-photon spatial correlations is widely tunable by varying the phase mismatch and relative phases of the two pump beams. The operating principle is suitable for practical implementation of reconfigurable photon sources in on-chip quantum circuits.	en_US
dc.relation.ispartof	Laser and Photonics Reviews	en_US
dc.relation.isbasedon	10.1002/lpor.201500216	en_US
dc.subject.classification	Optoelectronics & Photonics	en_US
dc.title	Tunable generation of entangled photons in a nonlinear directional coupler	en_US
dc.type	Journal Article
utslib.citation.volume	1	en_US
utslib.citation.volume	10	en_US
utslib.for	0201 Astronomical and Space Sciences	en_US
utslib.for	0205 Optical Physics	en_US
utslib.for	0206 Quantum Physics	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	closed_access
pubs.issue	1	en_US
pubs.publication-status	Published	en_US
pubs.volume	10	en_US

Abstract:

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA. The on-chip integration of quantum light sources has enabled the realization of complex quantum photonic circuits. However, for the practical implementation of such circuits in quantum information applications, it is crucial to develop sources delivering entangled quantum photon states with on-demand tunability. Here we propose and experimentally demonstrate the concept of a widely tunable quantum light source based on spontaneous parametric down-conversion in a simple nonlinear directional coupler. We show that spatial photon-pair correlations and entanglement can be reconfigured on-demand by tuning the phase difference between the pump beams and the phase mismatch inside the structure. We experimentally demonstrate the generation of split states, robust N00N states, various intermediate regimes and biphoton steering on a single chip. Furthermore we theoretically investigate other regimes allowing all-optically tunable generation of all Bell states and flexible control of path-energy entanglement. Such wide-range capabilities of a structure comprised of just two coupled nonlinear waveguides are attributed to the intricate interplay between linear coupling and nonlinear phase matching. This scheme provides an important advance towards the realization of reconfigurable quantum circuitry. An integrated all-optically tunable source of two-photon quantum states based on spontaneous parametric down-conversion is experimentally demonstrated in a directional coupler consisting of two lithium niobate waveguides. The degree of entanglement and shape of two-photon spatial correlations is widely tunable by varying the phase mismatch and relative phases of the two pump beams. The operating principle is suitable for practical implementation of reconfigurable photon sources in on-chip quantum circuits.

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http://hdl.handle.net/10453/112158