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QUANTUM STATE TRANSFER THROUGH A QUBIT NETWORK WITH ENERGY SHIFTS AND FLUCTUATIONS

Casaccino, A; Lloyd, S; Mancini, S; Severini, S; (2009) QUANTUM STATE TRANSFER THROUGH A QUBIT NETWORK WITH ENERGY SHIFTS AND FLUCTUATIONS. INT J QUANTUM INF , 7 (8) 1417 - 1427. 10.1142/S0219749909006085.

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Abstract

We study quantum state transfer through a qubit network modeled by spins with XY interaction, when relying on a single excitation. We show that it is possible to achieve perfect transfer by shifting (adding) energy to specific vertices. This technique appears to be a potentially powerful tool for changing, and in some cases improving, the transfer capabilities of quantum networks. Analytical results are presented for all-to-all networks and for all-to-all networks with a missing link. Moreover, we evaluate the effect of random fluctuations on the transmission fidelity.

Type:Article
Title:QUANTUM STATE TRANSFER THROUGH A QUBIT NETWORK WITH ENERGY SHIFTS AND FLUCTUATIONS
DOI:10.1142/S0219749909006085
Keywords:Spin networks, graph theory, quantum communication, COMMUNICATION, DYNAMICS
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Computer Science

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