Uncollapsing of a quantum state in a superconducting phase qubit

Details Uncollapsing of a quantum state in a superconducting phase qubit Uncollapsing of a quantum state in a superconducting phase qubit

2008-06-22

arxiv.org/abs/0806.3547v1

Phys. Rev. Lett. 101, 200401 (2008)

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

We demonstrate in a superconducting qubit the conditional recovery ("uncollapsing") of a quantum state after a partial-collapse measurement. A weak measurement extracts information and results in a non-unitary transformation of the qubit state. However, by adding a rotation and a second partial measurement with the same strength, we erase the extracted information, effectively canceling the effect of both measurements. The fidelity of the state recovery is measured using quantum process tomography and found to be above 70% for partial-collapse strength less than 0.6.

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