Quantum Information, 2 Volume Set, 2nd Edition

32 Echo‐Based Quantum Memory

G. T. Campbell K. R. Ferguson M. J. Sellars B. C. Buchler and P. K. Lam

The Australian National University, Centre for Quantum Computation and Communication Technology, Research School of Physics and Engineering, Canberra, ACT 2601, Australia

Attenuation in optical fibers means that it is necessary to use quantum repeaters as an element in future communication networks. Without them, the rate at which photons can be successfully sent through a long fiber is too low to send complex states. To overcome the nondeterministic nature of successful transmission events, memories must be used to store photons that correspond to successful entanglement swapping operations (1). A number of approaches to achieving ...