Reversing the Weak Quantum Measurement for a Photonic Qubit

Details Reversing the Weak Quantum Measurement for a Photonic Qubit Reversing the Weak Quantum Measurement for a Photonic Qubit

2009-03-18

arxiv.org/abs/0903.3077v1

Opt. Express 17, 11978 (2009)

Physics

Quantum Physics

Scientific paper

We demonstrate the conditional reversal of a weak (partial-collapse) quantum measurement on a photonic qubit. The weak quantum measurement causes a nonunitary transformation of a qubit which is subsequently reversed to the original state after a successful reversing operation. Both the weak measurement and the reversal operation are implemented linear optically. The state recovery fidelity, determined by quantum process tomography, is shown to be over 94% for partial-collapse strength up to 0.9. We also experimentally study information gain due to the weak measurement and discuss the role of the reversing operation as an information erasure.

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