Resource-efficient linear optical quantum computation
arXiv:quant-ph/0405157 · doi:10.1103/PhysRevLett.95.010501
Abstract
We introduce a scheme for linear optics quantum computation, that makes no use of teleported gates, and requires stable interferometry over only the coherence length of the photons. We achieve a much greater degree of efficiency and a simpler implementation than previous proposals. We follow the "cluster state" measurement based quantum computational approach, and show how cluster states may be efficiently generated from pairs of maximally polarization entangled photons using linear optical elements. We demonstrate the universality and usefulness of generic parity measurements, as well as introducing the use of redundant encoding of qubits to enable utilization of destructive measurements - both features of use in a more general context.
5 pages, 6 figures. In this new version we have corrected typos and minor errors, emphasised the scheme's robustness against phase-instability and improved readability by restructuring the introduction
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