Quantum communication through an unmodulated spin chain.

By Sougato Bose. Physical Review Letters, 2002

1,160 citations recorded by the source corpus.

We propose a scheme for using an unmodulated and unmeasured spin chain as a channel for short distance quantum communications. The state to be transmitted is placed on one spin of the chain and received later on a distant spin with some fidelity. We first obtain simple expressions for the fidelity of quantum state transfer and the amount of entanglement sharable between any two sites of an arbitrary Heisenberg ferromagnet using our scheme. We then apply this to the realizable case of an open ended chain with nearest neighbor interactions. The fidelity of quantum state transfer is obtained as an inverse discrete cosine transform and as a Bessel function series. We find that in a reasonable time, a qubit can be directly transmitted with better than classical fidelity across the full length of chains of up to 80 spins. Moreover, our channel allows distillable entanglement to be shared over arbitrary distances.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/83fc7012e35663eaa3e0293a5cf815fa1afea072

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In Atomic and Molecular Physics, and Optics

Citations in the corpus

Entanglement entropy in quantum impurity systems and systems with boundaries (2009, positive): “As a final motivation, we note that recent models for qubit teleportation and quantum state transfer using quantum spin chains [23, 24, 25, 26, 27, 28, 29, 30, 31] employ models closely related to the quantum spin models reviewed and in many cases rely on properties of the entanglement arising from ”
Entanglement in many-body systems (2007, background): “Spin networks have been proposed as quantum channels (Bose, 2003) by exploiting the collective dynamics of their low lying excitations for transporting quantum information.”
Training Schrödinger’s cat: quantum optimal control (2015, background): “Moreover, significant progress has been made in understanding how to optimally control coupled spin systems with more than two spins [36, 37, 45, 64, 71, 72, 73, 74, 202, 203, 209, 235, 296, 339, 363, 369, 395, 396, 424, 440, 441, 456, 458, 459, 460, 462].”
Quantum channels and memory effects (2012, background): “An unmodulated spin chain has been proposed as a model for short distance quantum communication (Bose, 2003).”