Method and apparatus for quantum information processing
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United States of America Patent
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Jun 29, 1999
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N/A
app pub date -
Oct 8, 1996
filing date -
Oct 8, 1996
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Abstract
An approach to processing quantum information uses a bulk ensemble of a very large number of identical entities as its source of quantum degrees of freedom. The information is represented as the deviation from uniform population probability for at least one of the quantum states of the ensemble. Coherences between quantum states, created when the ensemble is modified in a way that removes it from thermal equilibrium can serve as effective degrees of freedom. A bulk thermal ensemble of nuclear spins in a static magnetic field is treated using nuclear magnetic resonance pulses for preparation of an initial pure state, and effecting arbitrary single-spin and coupled multi-spin rotations. Readout of the result is accomplished by observation of the magnetization of the ensemble.
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