Dissipative remote-state preparation in an interacting medium

Abstract

Standard quantum state preparation methods work by preparing a required state locally and then distributing it to a distant location by a free-space propagation. We instead study procedures of preparing a target state at a remote location in the presence of an interacting background medium on which no control is required, manipulating only local dissipation. In mathematical terms, we characterize a set of reduced steady states stabilizable by local dissipation. An explicit local method is proposed by which one can construct a wanted one-site reduced steady state at an arbitrary remote site in a lattice of any size and geometry. In the chain geometry we also prove uniqueness of such a steady state. We demonstrate that the convergence time to fixed precision is smaller than the inverse gap, and we study robustness of the scheme in different medium interactions.

5 pages, 4 figures

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• Targeting pure quantum states by strong noncommutative dissipation
• Spin-helix states in the $XXZ$ spin chain with strong dissipation
• General approach to find steady-state manifolds in Markovian and non-Markovian systems
• Dissipative Quantum Metrology