Quantum communication via a continuously monitored dual spin chain

Details Quantum communication via a continuously monitored dual spin chain Quantum communication via a continuously monitored dual spin chain

2007-02-04

arxiv.org/abs/quant-ph/0702029v1

Phys. Rev. A 75, 062328 (2007)

Physics

Quantum Physics

5 pages, revtex 4, 3 eps figures

Scientific paper

10.1103/PhysRevA.75.062328

We analyze a recent protocol for the transmission of quantum states via a dual spin chain [Burgarth and Bose, Phys. Rev. A 71, 052315 (2005)] under the constraint that the receiver's measurement strength is finite. That is, we consider the channel where the ideal, instantaneous and complete von Neumann measurements are replaced with a more realistic continuous measurement. We show that for optimal performance the measurement strength must be "tuned" to the channel spin-spin coupling, and once this is done, one is able to achieve a similar transmission rate to that obtained with ideal measurements. The spin chain protocol thus remains effective under measurement constraints.

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