Undoing a weak quantum measurement of a solid-state qubit

Details Undoing a weak quantum measurement of a solid-state qubit Undoing a weak quantum measurement of a solid-state qubit

2006-06-28

arxiv.org/abs/cond-mat/0606713v1

Phys. Rev. Lett. 97, 166805 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages

Scientific paper

10.1103/PhysRevLett.97.166805

We propose an experiment which demonstrates the undoing of a weak continuous measurement of a solid-state qubit, so that any unknown initial state is fully restored. The undoing procedure has only a finite probability of success because of the non-unitary nature of quantum measurement, though it is accompanied by a clear experimental indication of whether or not the undoing has been successful. The probability of success decreases with increasing strength of the measurement, reaching zero for a traditional projective measurement. Measurement undoing (``quantum un-demolition'') may be interpreted as a kind of a quantum eraser, in which the information obtained from the first measurement is erased by the second measurement, which is an essential part of the undoing procedure. The experiment can be realized using quantum dot (charge) or superconducting (phase) qubits.

Affiliated with

Also associated with

No associations

Rating

Undoing a weak quantum measurement of a solid-state qubit does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Undoing a weak quantum measurement of a solid-state qubit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Undoing a weak quantum measurement of a solid-state qubit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-534946