Measurement based noiseless linear amplifier and its applications towards a quantum repeater

  • Event Date: 2017-08-08
  • AMO/QIS/CMT
  • Speaker: Dr. Syed M Assad, Centre for Quantum Computation and Communication Technology, Department of Quantum Science, The Australian National University  /  Host: Prof. Ray-Kuang Lee (NTHU)
    Place: P512 of NCTS, 5F, 3rd General Building, Nat'l Tsing Hua Univ.

We implemented a measurement-based noiseless linear amplifier and use it to amplify arbitrary coherent states. The amplification events are probabilistic but heralded, yielding outputs that suffer less noise than those amplified by a deterministic amplifier. We experimentally demonstrated its use to
 (A) recover EPR entanglement lost through a lossy transmission,
 (B)

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clone arbitrary coherent states with fidelity better than the deterministic cloning limit and
 (C) increase the signal to noise ratio of information carrying coherent states.

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