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Manipulation of multiphoton entanglement in waveguide quantum circuits

Manipulation of multiphoton entanglement in waveguide quantum circuits
Manipulation of multiphoton entanglement in waveguide quantum circuits
On-chip integrated photonic circuits are crucial to further progress towards quantum technologies and in the science of quantum optics. Here we report precise control of single photon states and multiphoton entanglement directly on-chip. We manipulate the state of path-encoded qubits using integrated optical phase control based on resistive elements, observing an interference contrast of 98.2 plusminus 0.3%. We demonstrate integrated quantum metrology by observing interference fringes with two- and four-photon entangled states generated in a waveguide circuit, with respective interference contrasts of 97.2 plusminus 0.4% and 92 plusminus 4%, sufficient to beat the standard quantum limit. Finally, we demonstrate a reconfigurable circuit that continuously and accurately tunes the degree of quantum interference, yielding a maximum visibility of 98.2 plusminus 0.9%. These results open up adaptive and fully reconfigurable photonic quantum circuits not just for single photons, but for all quantum states of light.
1749-4885
346-350
Matthews, Jonathan
d386ed20-9407-4274-aa39-202aa83e372f
Politi, Alberto
cf75c0a8-d34d-4cbe-b9d5-e408c0edeeec
Stefanov, André
8fc6b0c5-0d3f-4859-a6aa-72e0f00e7250
O'Brien, Jeremy
850b6d73-858f-4140-a054-547ae011e435
Matthews, Jonathan
d386ed20-9407-4274-aa39-202aa83e372f
Politi, Alberto
cf75c0a8-d34d-4cbe-b9d5-e408c0edeeec
Stefanov, André
8fc6b0c5-0d3f-4859-a6aa-72e0f00e7250
O'Brien, Jeremy
850b6d73-858f-4140-a054-547ae011e435

Matthews, Jonathan, Politi, Alberto, Stefanov, André and O'Brien, Jeremy (2009) Manipulation of multiphoton entanglement in waveguide quantum circuits. Nature Photonics, 3, 346-350. (doi:10.1038/nphoton.2009.93).

Record type: Article

Abstract

On-chip integrated photonic circuits are crucial to further progress towards quantum technologies and in the science of quantum optics. Here we report precise control of single photon states and multiphoton entanglement directly on-chip. We manipulate the state of path-encoded qubits using integrated optical phase control based on resistive elements, observing an interference contrast of 98.2 plusminus 0.3%. We demonstrate integrated quantum metrology by observing interference fringes with two- and four-photon entangled states generated in a waveguide circuit, with respective interference contrasts of 97.2 plusminus 0.4% and 92 plusminus 4%, sufficient to beat the standard quantum limit. Finally, we demonstrate a reconfigurable circuit that continuously and accurately tunes the degree of quantum interference, yielding a maximum visibility of 98.2 plusminus 0.9%. These results open up adaptive and fully reconfigurable photonic quantum circuits not just for single photons, but for all quantum states of light.

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Published date: 24 May 2009
Organisations: Quantum, Light & Matter Group

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Local EPrints ID: 358550
URI: http://eprints.soton.ac.uk/id/eprint/358550
ISSN: 1749-4885
PURE UUID: c945cd5f-c1b8-47a2-9179-ede26ae5e3f0
ORCID for Alberto Politi: ORCID iD orcid.org/0000-0002-3668-9474

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Date deposited: 11 Oct 2013 13:14
Last modified: 17 Dec 2019 01:36

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Contributors

Author: Jonathan Matthews
Author: Alberto Politi ORCID iD
Author: André Stefanov
Author: Jeremy O'Brien

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