2016
DOI: 10.1088/2040-8978/18/9/094007
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Large scale quantum walks by means of optical fiber cavities

Abstract: We demonstrate a platform for implementing quantum walks that overcomes many of the barriers associated with photonic implementations. We use coupled fiber-optic cavities to implement time-bin encoded walks in an integrated system. We show that this platform can achieve very low losses combined with high-fidelity operation, enabling an unprecedented large number of steps in a passive system, as required for scenarios with multiple walkers. Furthermore the platform is reconfigurable, enabling variation of the c… Show more

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Cited by 42 publications
(34 citation statements)
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“…Possible experimental implementations include nuclear magnetic resonance [33,34], trapped ions [35,36] and atoms [37,38]. Considering photonic systems, translating the walker in the spatial degree of freedom might seem most straight-forward [39][40][41][42][43][44][45][46], however, implementations utilising time as the external degree of freedom outperform spatiallly multiplexed systems in terms of resource efficiency and stability [47][48][49][50][51][52][53]. Other possible degrees of freedom include spectral distributions or orbital angular momentum [54,55].…”
Section: Introductionmentioning
confidence: 99%
“…Possible experimental implementations include nuclear magnetic resonance [33,34], trapped ions [35,36] and atoms [37,38]. Considering photonic systems, translating the walker in the spatial degree of freedom might seem most straight-forward [39][40][41][42][43][44][45][46], however, implementations utilising time as the external degree of freedom outperform spatiallly multiplexed systems in terms of resource efficiency and stability [47][48][49][50][51][52][53]. Other possible degrees of freedom include spectral distributions or orbital angular momentum [54,55].…”
Section: Introductionmentioning
confidence: 99%
“…The discrete-time quantum walk (DTQW), the quantum mechanical analogue of the random walk, is a well-established platform for the simulation of particle dynamics (6) , and has been used as an instrument to explore the quantum advantage by transferring concepts developed in the classical context to the quantum realm (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23). Yet, the border between classical and quantum world is not strictly set and depends on the semantic environment.…”
Section: Introductionmentioning
confidence: 99%
“…Indeed, considering a single particle system, it has been demonstrated that using coherent light is sufficient to simulate arbitrary quantum states and unconditional quantum dynamics, e.g. transport phenomena (7,8,10,13,16,(21)(22)(23) or decoherence (11)(12)(13). These experiments were possible due to the well-established equivalence of propagation of coherent light across a linear optical network and the dynamics of a single quantum particle (see p. 106 in (25)).…”
Section: Introductionmentioning
confidence: 99%
“…Motivated by recent realisations of quantum walks in linear optical setups with time-bin encoding [14][15][16][17], we implement the memory system and multiple ancillashere, corresponding to three time steps-by encoding on a single photon. The ancillas, which can be read to obtain the classical outcomes of the process, are encoded in the arrival time of the photon, and the memory state of the simulator is encoded in its polarisation.…”
Section: Experimental Implementationmentioning
confidence: 99%