Pretty good state transfer of entangled states through quantum spin chains

Abstract

The XX model with uniform couplings represents the most natural choice for quantum state transfer through spin chains. Given that it has long been established that single-qubit states cannot be transferred with perfect fidelity in this model, the notion of pretty good state transfer has been recently introduced as a relaxation of the constraints on fidelity. In this paper, we study the transfer of multi-qubit entangled and unentangled states through unmodulated spin chains, and we prove that it is possible to have pretty good state transfer of any multi-particle state. This significantly generalizes the previous results on single-qubit state transfer, and opens way to using uniformly coupled spin chains as quantum channels for the transfer of arbitrary states of any dimension. Our results could be tested with current technology.

Version published in New Journal of Physics

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Cited by in corpus (6)

• Transfer of arbitrary two qubit states via a spin chain
• NOON States via Quantum Walk of Bound Particles
• Turnplate of quantum state
• Robust and efficient transport of two-qubit entanglement via disordered spin chains
• Perfect quantum state transfer of hard-core bosons on weighted path graphs
• A switching approach for perfect state transfer over a scalable and routing enabled network architecture with superconducting qubits