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Conferences > QELS > 2010 > QThK > QThK6

Reversing the weak quantum measurement for a photonic qubit

Yong-Su Kim, Young-Wook Cho, Young-Sik Ra, and Yoon-Ho Kim

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Abstract

We demonstrate the conditional reversal of a weak quantum measurement on a photonic qubit. 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.

© 2010 Optical Society of America

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