Quantum walks of two correlated photons in a 2D synthetic lattice

Esposito, Chiara; Barros, M. R.; Hernández, Andrés Durán; Carvacho, Gonzalo; Colandrea, Francesco Di; Barboza, Raouf; Cardano, Filippo; Spagnolo, Nicolò; Marrucci, Lorenzo; Sciarrino, Fabio

doi:10.1038/s41534-022-00544-0

Cited by 22 publications

(11 citation statements)

References 53 publications

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“… – 9 Large-scale photonic platforms are one of the most promising candidates to implement quantum information and quantum computation protocols 10 , 11 . Indeed, they have been extensively employed for quantum walks routines, 12 – 14 quantum machine learning algorithms, 15 – 17 and, recently, for experiments that aim at demonstrating quantum advantage with photons 18 – 20 All these protocols in classical and quantum optics require complex interferometric structures composed of numerous optical components.…”

Section: Introductionmentioning

confidence: 99%

Characterization of multimode linear optical networks

et al. 2023

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Multimode optical interferometers represent the most viable platforms for the successful implementation of several quantum information schemes that take advantage of optical processing. Examples range from quantum communication and sensing, to computation, including optical neural networks, optical reservoir computing, or simulation of complex physical systems. The realization of such routines requires high levels of control and tunability of the parameters that define the operations carried out by the device. This requirement becomes particularly crucial in light of recent technological improvements in integrated photonic technologies, which enable the implementation of progressively larger circuits embedding a considerable amount of tunable parameters. We formulate efficient procedures for the characterization of optical circuits in the presence of imperfections that typically occur in physical experiments, such as unbalanced losses and phase instabilities in the input and output collection stages. The algorithm aims at reconstructing the transfer matrix that represents the optical interferometer without making any strong assumptions about its internal structure and encoding. We show the viability of this approach in an experimentally relevant scenario, defined by a tunable integrated photonic circuit, and we demonstrate the effectiveness and robustness of our method. Our findings can find application in a wide range of optical setups, based on both bulk and integrated configurations.

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Section: Introductionmentioning

confidence: 99%

Characterization of multimode linear optical networks

et al. 2023

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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.

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“…Its outstanding performance has prompted the development of several two-dimensional (2D) materials in the last few years. These materials include phosphorene, , arsenene, − transition metal dichalcogenides (e.g., MoS 2 , GaSe, WSe 2 , WTe 2 ), , organic crystals, and artificial 2D lattices. , Among these materials, the 2D hexagonal structures formed by Si and Ge, namely, silicene and germanene, − are the most similar to graphene. However, in contrast to the planar configuration of graphene, silicene and germanene exhibit low-buckled structures that are more thermally stable than their planar counterparts ,, (except that some conditions could lead to quantum phase transitions).…”

Section: Introductionmentioning

confidence: 99%

Feature-Rich Electronic Properties of Sliding Bilayer Germanene

Liu

2022

ACS Omega

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This study employs first-principles calculations to elucidate the properties of sliding bilayer germanene (BLGe). The buckled structure of germanene can afford a greater number of metastable stacking configurations than planar graphene and enrich the electronic properties. Herein, a detailed analysis of the structural variety, shift-dependent energy bands, and spatial charge densities of BLGe is presented. The projected density of states (PDOS) reveals diverse structures such as plateaus, dips, symmetric/asymmetric peaks, and shoulders. The low-lying ones of the prominent structures could correspond to single or multiorbital hybridization, depending on the stacking configuration.

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Quantum walks of two correlated photons in a 2D synthetic lattice

Cited by 22 publications

References 53 publications

Characterization of multimode linear optical networks

Characterization of multimode linear optical networks

Dynamic conditioning of two particle discrete-time quantum walks

Feature-Rich Electronic Properties of Sliding Bilayer Germanene

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