Simultaneous multiple-user quantum communication across a spin-chain channel

Yousefjani, Rozhin; Bayat, Abolfazl

doi:10.1103/physreva.102.012418

Cited by 20 publications

(29 citation statements)

References 51 publications

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“…A similar geometry is adopted in Refs. [ 4 , 6 ] with multiple sender (receiver) non-interacting spins coupled to the wire at the edges.…”

Section: The Modelmentioning

confidence: 99%

“…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%

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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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“…A similar geometry is adopted in Refs. [ 4 , 6 ] with multiple sender (receiver) non-interacting spins coupled to the wire at the edges.…”

Section: The Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two-Excitation Routing via Linear Quantum Channels

Apollaro

Chetcuti

2020

Entropy

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show abstract

“…A similar geometry is adopted in Refs. [5,7] with multiple sender (receiver) non-interacting spins coupled to the wire at the edges. Here we consider only one receiver block coupled to the wire for each execution of the routing protocol and, as we shall see, this allows us to assume uniform coupling within each component of the setup, i.e, the sender, the wire and the receiver blocks.…”

Section: The Modelmentioning

confidence: 99%

“…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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“…One attempt at switching and routing was proposed in [47] which involves creating new edges and coupling for qubits but is still not scalable. Various other works describe methods of routing of excitations in spin chains [48][49][50], limited to one dimension. In this work we resolve this problem through our hypercube switching scheme.…”

Section: Introductionmentioning

confidence: 99%

Perfect state transfer on hypercubes and its implementation using superconducting qubits

et al. 2020

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We propose a protocol for perfect state transfer between any pair of vertices in a hypercube. Given a pair of distinct vertices in the hypercube, we determine a subhypercube that contains the pair of vertices as antipodal vertices. Then a switching process is introduced for determining the subhypercube of a memory-enhanced hypercube that facilitates perfect state transfer between the desired pair of vertices. Furthermore, we propose a physical architecture for the pretty good state transfer implementation of our switching protocol with fidelity arbitrary close to unity, using superconducting transmon qubits with tunable couplings. The switching is realized by the control over the effective coupling between the qubits resulting from the effect of ancilla qubit couplers for the graph edges. We also report an error bound on the fidelity of state transfer due to faulty implementation of our protocol.

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Simultaneous multiple-user quantum communication across a spin-chain channel

Cited by 20 publications

References 51 publications

Two-Excitation Routing via Linear Quantum Channels

Two-Excitation Routing via Linear Quantum Channels

Two-Excitation Routing via Linear Quantum Channels

Perfect state transfer on hypercubes and its implementation using superconducting qubits

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