Quantum Bit Regeneration

Details Quantum Bit Regeneration Quantum Bit Regeneration

1996-04-25

arxiv.org/abs/quant-ph/9604031v1

Phys. Rev. Lett. May 13, 1996

Physics

Quantum Physics

4 pages, postscript only, figures available at http://feynman.stanford.edu/qcomp

Scientific paper

10.1103/PhysRevLett.76.4281

Decoherence and loss will limit the practicality of quantum cryptography and computing unless successful error correction techniques are developed. To this end, we have discovered a new scheme for perfectly detecting and rejecting the error caused by loss (amplitude damping to a reservoir at T=0), based on using a dual-rail representation of a quantum bit. This is possible because (1) balanced loss does not perform a ``which-path'' measurement in an interferometer, and (2) balanced quantum nondemolition measurement of the ``total'' photon number can be used to detect loss-induced quantum jumps without disturbing the quantum coherence essential to the quantum bit. Our results are immediately applicable to optical quantum computers using single photonics devices.

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