Qubit readout via controlled coherent tunnelling to probe state
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United States of America Patent
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Jan 20, 2009
Grant Date -
Nov 16, 2006
app pub date -
Aug 10, 2004
filing date -
Aug 11, 2003
priority date (Note) -
Expired
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Abstract
This invention concerns quantum computers in which the qubits are closed systems, in that the particle or particles are confined within the structure. A “site” can be produced by any method of confining an electron or other quantum particle, such as a dopant atom, a quantum dot, a cooper pair box, or any combination of these. In particular the invention concerns a closed three-site quantum particle system. The state in the third site is weakly coupled by coherent tunneling to the first and second states, so that the third state is able to map out the populations of the first and second states as its energy is scanned with respect to the first and second states. In second and third aspects it concerns a readout method for a closed three-state quantum particle system.
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