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Journal Article

Quantum state transfer through time reversal of an optical channel


Bentley,  Christopher
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Hush, M. R., Bentley, C., Ahlefeldt, R. L., James, M. R., Sellars, M. J., & Ugrinovskii, V. (2016). Quantum state transfer through time reversal of an optical channel. Physical Review A, 94(6): 062302. doi:10.1103/PhysRevA.94.062302.

Cite as: http://hdl.handle.net/21.11116/0000-0003-2895-8
Rare-earth ions have exceptionally long coherence times, making them an excellent candidate for quantum information processing. A key part of this processing is quantum state transfer. We show that perfect state transfer can be achieved by time reversing the intermediate quantum channel, and suggest using a gradient echo memory (GEM) to perform this time reversal. We propose an experiment with rare-earth ions to verify these predictions, where an emitter and receiver crystal are connected with an optical channel passed through a GEM. We investigate the effect experimental imperfections and collective dynamics have on the state transfer process. We demonstrate that super-radiant effects can enhance coupling into the optical channel and improve the transfer fidelity. We lastly discuss how our results apply to state transfer of entangled states.