Quantum communication via a continuously monitored dual spin chain

Abstract

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.

5 pages, revtex 4, 3 eps figures

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• Arbitrary perfect state transfer in $d$-level spin chains
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• Measurement quench in many-body systems
• Turnplate of quantum state
• Temperature-dependent remote control of polarization and coherence intensity with pure sender's initial state
• Tunable refraction in a two dimensional quantum metamaterial
• Remote control of quantum correlations in two-qubit receiver via three-qubit sender
• Measurement enhances long-distance Entanglement generation in spin chains with dissipative processes
• Perfect transfer of arbitrary continuous variable states across optical waveguide lattices