Quantum-state transfer in staggered coupled-cavity arrays

Almeida, G. M. A.; Ciccarello, Francesco; Apollaro, Tony J. G.; Souza, André M. C.

doi:10.1103/physreva.93.032310

Cited by 69 publications

(66 citation statements)

References 62 publications

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“…Further extensions of our work include investigating the role of internal correlations in disordered channels for high-fidelity state transfer based on weakly-coupled communicating parties [4,27,43]. In these models, even though the bulk of the chain is usually weakly populated during the transmission process, the presence of extended eigenstates in the bulk is crucial to support long-distance communication protocols.…”

Section: Discussionmentioning

confidence: 99%

“…By adding in local defects, either in form of magnetic fields or coupling strengths, it is possible to carry out high-fidelity quantum-state transfer (it takes place by effectively reducing the operating Hilbert space) [4,6,7,10,11,33], routing protocols [34][35][36], and to control and enhance entanglement distribution [13,14]. Also, it has been shown that gapped dimerized models plays a major role in establishing long-distance communication [6,17,19,21,27,33].…”

Section: Introductionmentioning

confidence: 99%

“…First, they bypass the need for inter-converting between photons and qubits, such as in hybrid light-matter devices [22,27,31], which demands a high degree of control and may lead to decoherence and losses. Moreover, most of the protocols require minimal user control (mostly at the sender and receiver sites) as the system's dynamics is driven through the evolution of the underlying Hamiltonian, offering thus a versatile toolbox for quantum information processing purposes.…”

Section: Introductionmentioning

confidence: 99%

“…Following that, it has been shown that low-dimensional spin chains can act as efficient (especially for short-distance communication) quantum "wires" for carrying out quantum-state transfer protocols [1][2][3][4][5][6][7][8][9][10][11] as well as creation and distribution of entanglement [12][13][14][15][16][17][18][19][20][21], both being pivotal tasks in quantum networks [22]. Physically, spin chains may be implemented in many platforms such as NMR systems [23], optical lattices [24,25], arrays of coupled cavity-QED systems [26,27], superconducting circuits [28], nitrogen vacancies in diamond [29], and waveguides [30].…”

Section: Introductionmentioning

confidence: 99%

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Disorder-assisted distribution of entanglement in XY spin chains

et al. 2017

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We study the creation and distribution of entanglement in disordered XY -type spin-1/2 chains for the paradigmatic case of a single flipped spin prepared on a fully polarized background. The local magnetic field is set to follow a disordered long-range-correlated sequence with power-law spectrum. Depending on the degree of correlations of the disorder, a set of extended modes emerge in the middle of the band yielding an interplay between localization and delocalization. As a consequence, a rich variety of entanglement distribution patterns arises, which we evaluate here through the concurrence between two spins. We show that, even in the presence of disorder, the entanglement wave can be pushed to spread out reaching distant sites and also enhance pairwise entanglement between the initial site and the rest of the chain. We also study the propagation of an initial maximallyentangled state through the chain and show that correlated disorder improves the transmission quite significantly when compared with the uncorrelated counterpart. Our work contributes in designing solid-state devices for quantum information processing in the realistic setting of correlated static disorder.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Disorder-assisted distribution of entanglement in XY spin chains

et al. 2017

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“…At any site, in our encoding, a single excitation |1 indicates an "up" spin in a system initially prepared to have all the spins "down", |0 . In previous literature [29,42,43] it has been demonstrated that related dimerized chains have high fidelity QST properties, which we will exploit in our protocol.…”

Section: The Modelmentioning

confidence: 99%

Robust quantum entanglement generation and generation-plus-storage protocols with spin chains

2017

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Reliable quantum communication/processing links between modules are a necessary building block for various quantum processing architectures. Here we consider a spin chain system with alternating strength couplings and containing three defects, that impose three domain walls between topologically distinct regions of the chain. We show that -in addition to its useful, high fidelity, quantum state transfer properties -an entangling protocol can be implemented in this system, with optional localisation and storage of the entangled states. We demonstrate both numerically and analytically that, given a suitable initial product-state injection, the natural dynamics of the system produces a maximally entangled state at a given time. We present detailed investigations of the effects of fabrication errors, analyzing random static disorder both in the diagonal and off-diagonal terms of the system Hamiltonian. Our results show that the entangled state formation is very robust against perturbations of up to ∼ 10% the weaker chain coupling, and also robust against timing injection errors. We propose a further protocol which manipulates the chain in order to localise and store each of the entangled qubits. The engineering of a system with such characteristics would thus provide a useful device for quantum information processing tasks involving the creation and storage of entangled resources.

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Fully Open Ring Microcavities Based on Metagratings

Zhou

2023

Advanced Photonics Research

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Open optical microcavities are crucial to precise manipulation of light–matter interaction in solid‐state and biological systems. However, only open linear microcavities are practically realized, limiting the application of open microcavities in more scenarios. Herein, an ease‐fabrication fully open ring microcavity is theoretically demonstrated that supports simultaneously multiple concentric cavity modes with coupling interaction. It comprises two orthogonal dielectric metagratings, which are a single layer of silicon rods and enable transmitted waves to travel in a negative angle. Except for fully open configuration, the open microcavity also incorporates the advantages of low absorption loss and the compatibility to the current CMOS process. It offers a unique platform for controlling the interaction between light and atoms, molecules, nanoparticles, or biomolecules and will find a broad range of applications.

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Quantum-state transfer in staggered coupled-cavity arrays

Cited by 69 publications

References 62 publications

Disorder-assisted distribution of entanglement in XY spin chains

Disorder-assisted distribution of entanglement in XY spin chains

Robust quantum entanglement generation and generation-plus-storage protocols with spin chains

Fully Open Ring Microcavities Based on Metagratings

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