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Coherent time evolution and boundary conditions of two-photon quantum walks in waveguide arrays

Coherent time evolution and boundary conditions of two-photon quantum walks in waveguide arrays
Coherent time evolution and boundary conditions of two-photon quantum walks in waveguide arrays
Multiphoton quantum walks in integrated optics comprise an attractive controlled quantum system, that can mimic less readily accessible quantum systems and exhibit behavior that cannot in general be accurately replicated by classical light without an exponential overhead in resources. The ability to observe the time evolution of such systems is important for characterizing multiparticle quantum dynamics—notably this includes the effects of boundary conditions for walks in spaces of finite size. Here we demonstrate the coherent evolution of quantum walks of two indistinguishable photons using planar arrays of 21 evanescently coupled waveguides fabricated in silicon oxynitride technology. We compare three time evolutions, that follow closely a model assuming unitary evolution, corresponding to three different lengths of the array—in each case we observe quantum interference features that violate classical predictions. The longest array includes reflecting boundary conditions
1050-2947
12308
Meinecke, J.D.A.
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Poulios, K.
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Politi, a.
cf75c0a8-d34d-4cbe-b9d5-e408c0edeeec
Matthews, J.C.F.
68d5da30-da61-44c8-93e7-4984784522b9
Peruzzo, A.
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Ismail, N.
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Wörhoff, K.
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O'Brien, J.L.
fb052b79-aa26-4d40-a661-dd08ae0b0dc4
Thompson, M.G.
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Meinecke, J.D.A.
2af4b770-c79b-47c2-85de-bcbaac0c04b0
Poulios, K.
d191058e-dd14-4edc-ac32-4bd1c7fecada
Politi, a.
cf75c0a8-d34d-4cbe-b9d5-e408c0edeeec
Matthews, J.C.F.
68d5da30-da61-44c8-93e7-4984784522b9
Peruzzo, A.
752ead40-0c4f-4107-b5ae-5c5587bfe1c2
Ismail, N.
c8bef083-5122-4a7f-b624-ef068d3c5ec2
Wörhoff, K.
7d7f4adf-195c-4ff0-8f79-9f561127a9bb
O'Brien, J.L.
fb052b79-aa26-4d40-a661-dd08ae0b0dc4
Thompson, M.G.
b1b92c69-d01a-467c-957f-0edc572d5f65

Meinecke, J.D.A., Poulios, K., Politi, a., Matthews, J.C.F., Peruzzo, A., Ismail, N., Wörhoff, K., O'Brien, J.L. and Thompson, M.G. (2013) Coherent time evolution and boundary conditions of two-photon quantum walks in waveguide arrays. Physical Review A, 88 (1), 12308. (doi:10.1103/PhysRevA.88.012308).

Record type: Article

Abstract

Multiphoton quantum walks in integrated optics comprise an attractive controlled quantum system, that can mimic less readily accessible quantum systems and exhibit behavior that cannot in general be accurately replicated by classical light without an exponential overhead in resources. The ability to observe the time evolution of such systems is important for characterizing multiparticle quantum dynamics—notably this includes the effects of boundary conditions for walks in spaces of finite size. Here we demonstrate the coherent evolution of quantum walks of two indistinguishable photons using planar arrays of 21 evanescently coupled waveguides fabricated in silicon oxynitride technology. We compare three time evolutions, that follow closely a model assuming unitary evolution, corresponding to three different lengths of the array—in each case we observe quantum interference features that violate classical predictions. The longest array includes reflecting boundary conditions

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PhysRevA.88.012308 - Version of Record
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Published date: 10 July 2013
Organisations: Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 377116
URI: http://eprints.soton.ac.uk/id/eprint/377116
ISSN: 1050-2947
PURE UUID: f1ee4681-a6e7-4649-a8d0-f9238d4802dd
ORCID for a. Politi: ORCID iD orcid.org/0000-0002-3668-9474

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Date deposited: 22 May 2015 12:54
Last modified: 17 Dec 2019 01:36

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