Enhancing nonclassical bosonic correlations in a quantum walk network through experimental control of disorder

Laneve, Alessandro; Nosrati, Farzam; Geraldi, Andrea; Mahdavipour, Kobra; Pegoraro, Federico; Shadfar, Mahshid Khazaei; Franco, Rosario Lo; Mataloni, Paolo

doi:10.1103/physrevresearch.3.033235

Cited by 7 publications

(4 citation statements)

References 56 publications

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“…Only a few experimental implementations of DTQWs with more than one walker have been demonstrated, e.g. to study bosonic and fermionic behaviour [30], disorder [32,46], the interplay of first and second order coherences [47], mimicking two-dimensional lattices with one walker [11] and two walkers in two-dimensional lattices [48].…”

Section: Introductionmentioning

confidence: 99%

Dynamic conditioning of two particle discrete-time quantum walks

et al. 2023

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In real photonic quantum systems losses are an unavoidable factor limiting the scalability to many modes and particles, restraining their application in fields as quantum information and communication. For this reason, a considerable amount of engineering effort has been taken in order to improve the quality of particle sources and system components. At the same time, data analysis and collection methods based on post-selection have been used to mitigate the effect of particle losses. This has allowed for investigating experimentally multi-particle evolutions where the observer lacks knowledge about the system's intermediate propagation states. Nonetheless, the fundamental question how losses affect the behaviour of the surviving subset of a multi-particle system has not been investigated so far. For this reason, here we study the impact of particle losses in a quantum walk of two photons reconstructing the output probability distributions for one photon conditioned on the loss of the other in a known mode and temporal step of our evolution network. We present the underlying theoretical model that we have devised in order to model controlled particle losses, we describe an experimental platform based on time-multiplexing, capable of implementing our theory and in the end we show how localized particle losses change the output distributions without altering their asymptotic spreading properties. Finally we devise a quantum civilization problem, a two walker generalisation of single particle recurrence processes.

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Section: Introductionmentioning

confidence: 99%

Dynamic conditioning of two particle discrete-time quantum walks

et al. 2023

Self Cite

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“…Only a few experimental implementations of DTQWs with more than one walker have been demonstrated, e.g. to study bosonic and fermionic behaviour 30 , disorder 32,46 , the interplay of first and second order coherences 47 , mimicking twodimensional lattices with one walker 11 and two walkers in two-dimensional lattices 48 .…”

Section: Introductionmentioning

confidence: 99%

Dynamic conditioning of two particle discrete-time quantum walks

Pegoraro¹,

Held²,

Barkhofen³

et al. 2023

Preprint

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In real photonic quantum systems losses are an unavoidable factor limiting the scalability to many modes and particles, restraining their application in fields as quantum information and communication. For this reason, a considerable amount of engineering effort has been taken in order to improve the quality of particle sources and system components. At the same time, data analysis and collection methods based on post-selection have been used to mitigate the effect of particle losses. This has allowed for investigating experimentally multi-particle evolutions where the observer lacks knowledge about the system's intermediate propagation states. Nonetheless, the fundamental question how losses affect the behaviour of the surviving subset of a multi-particle system has not been investigated so far. For this reason, here we study the impact of particle losses in a quantum walk of two photons reconstructing the output probability distributions for one photon conditioned on the loss of the other in a known mode and temporal step of our evolution network. We present the underlying theoretical scheme that we have devised in order to model controlled particle losses, we describe an experimental platform capable of implementing our theory in a time multiplexing encoding. In the end we show how localized particle losses change the output distributions without altering their asymptotic spreading properties. Finally we devise a quantum civilization problem, a two walker generalisation of single particle recurrence processes.

show abstract

“…In addition to quantum error correction and topological quantum computing, one may consider error suppression that would reduce, but not fully eliminate, the effect of decoherence while processing a quantum state [40]. A variety of methods have been considered to achieve this goal [41][42][43][44][45][46][47][48][49][50]; however, the efficiency of these methods is deeply related to the problems of preserving entanglement in (open) quantum systems [51][52][53][54][55][56][57][58] (for a review, see Ref. [59]).…”

Section: Introductionmentioning

confidence: 99%

Suppressing Decoherence in Quantum State Transfer with Unitary Operations

Gavreev

Kiktenko

Mastiukova

et al. 2022

Entropy

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Decoherence is the fundamental obstacle limiting the performance of quantum information processing devices. The problem of transmitting a quantum state (known or unknown) from one place to another is of great interest in this context. In this work, by following the recent theoretical proposal, we study an application of quantum state-dependent pre- and post-processing unitary operations for protecting the given (multi-qubit) quantum state against the effect of decoherence acting on all qubits. We observe the increase in the fidelity of the output quantum state both in a quantum emulation experiment, where all protecting unitaries are perfect, and in a real experiment with a cloud-accessible quantum processor, where protecting unitaries themselves are affected by the noise. We expect the considered approach to be useful for analyzing capabilities of quantum information processing devices in transmitting known quantum states. We also demonstrate the applicability of the developed approach for suppressing decoherence in the process of distributing a two-qubit state over remote physical qubits of a quantum processor.

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Enhancing nonclassical bosonic correlations in a quantum walk network through experimental control of disorder

Cited by 7 publications

References 56 publications

Dynamic conditioning of two particle discrete-time quantum walks

Dynamic conditioning of two particle discrete-time quantum walks

Dynamic conditioning of two particle discrete-time quantum walks

Suppressing Decoherence in Quantum State Transfer with Unitary Operations

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