Efficient routing quantum information in one-dimensional tight-binding array

Chen, Bing; He, Yu-Zhen; Chu, Tiantian; Shen, Qing-Hui; Zhang, Jiaming; Peng, Yandong

doi:10.1093/ptep/ptaa051

Cited by 3 publications

(2 citation statements)

References 33 publications

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“…While a great amount of work has been devoted to the routing of the quantum state of a single qubit [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ], where the fidelity of the transfer protocol can be expressed in terms of the transition amplitude of a single excitation between a sender and a receiver location [ 12 ], the routing of a multiple qubit state is a far less investigated scenario. Although several protocols have been proposed both for two-qubit and multi-partite entangled quantum state transfer [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ], their extension to a routing configuration on an arbitrary network is not straightforward.…”

Section: Introductionmentioning

confidence: 99%

Two-Excitation Routing via Linear Quantum Channels

Apollaro

Chetcuti

2020

Entropy

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Routing quantum information among different nodes in a network is a fundamental prerequisite for a quantum internet. While single-qubit routing has been largely addressed, many-qubit routing protocols have not been intensively investigated so far. Building on a recently proposed many-excitation transfer protocol, we apply the perturbative transfer scheme to a two-excitation routing protocol on a network where multiple two-receivers block are coupled to a linear chain. We address both the case of switchable and permanent couplings between the receivers and the chain. We find that the protocol allows for efficient two-excitation routing on a fermionic network, although for a spin-12 network only a limited region of the network is suitable for high-quality routing.

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Section: Introductionmentioning

confidence: 99%

Two-Excitation Routing via Linear Quantum Channels

Apollaro

Chetcuti

2020

Entropy

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show abstract

“…While a great amount of work has been devoted to the routing of the quantum state of a single qubit [4][5][6][7][8][9][10][11][12], where the fidelity of the transfer protocol can be expressed in terms of the transition amplitude of a single excitation between a sender and a receiver location [13], the routing of a multiple qubit state is a far less investigated scenario. Although several protocols have been proposed both for two-qubit and multi-partite entangled quantum state transfer [14][15][16][17][18][19][20][21][22][23], their extension to a routing configuration on an arbitrary network is not straightforward.…”

Section: Introductionmentioning

confidence: 99%

Two-Excitation Routing via Linear Quantum Channels

Apollaro¹,

Chetcuti²

2020

Preprint

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Routing quantum information among different nodes in a network is a fundamental prerequisite for a quantum internet. While single-qubit routing has been largely addressed, many-qubit routing protocols have not been intensively investigated so far. Building on the many-excitation transfer protocol in Ref. , we apply the perturbative transfer scheme to a two-excitation routing protocol on a network where multiple two-receivers block are coupled to a linear chain. We address both the case of switchable and permanent couplings between the receivers and the chain. We find that the protocol allows for efficient two-excitation routing on a fermionic network, although for a spin-12 network only a limited region of the network is suitable for high-quality routing.

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Quantum routing of information using chiral quantum walks

Bottarelli

Frigerio

Paris

2023

AVS Quantum Science

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We address routing of classical and quantum information over quantum network and show how to exploit chirality (directionality) to achieve nearly optimal and robust transport. In particular, we prove how continuous-time chiral quantum walks over a minimal graph are able to model directional transfer of information over a network. At first, we show how classical information, encoded onto an excitation localized at one vertex of a simple graph, may be sent to any other chosen location with nearly unit fidelity by tuning a single phase. Then, we prove that high-fidelity transport is also possible for coherent superpositions of states, i.e., for routing of quantum information. Furthermore, we show that by tuning the phase parameter, one obtains universal quantum routing, i.e., independent on the input state. In our scheme, chirality is governed by a single phase, and the routing probability is robust against fluctuations of this parameter. Finally, we address characterization of quantum routers and show how to exploit the self-energies of the graph to achieve high precision in estimating the phase parameter.

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Efficient routing quantum information in one-dimensional tight-binding array

Cited by 3 publications

References 33 publications

Two-Excitation Routing via Linear Quantum Channels

Two-Excitation Routing via Linear Quantum Channels

Two-Excitation Routing via Linear Quantum Channels

Quantum routing of information using chiral quantum walks

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