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6 September 2011 Physical implementation of non-physical quantum operations: realization of the universal transpose operation
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Abstract
The universal transpose of quantum states is an anti-unitary transformation that is not allowed in quantum theory. In this work, we investigate approximating the universal transpose of quantum states of two-level systems (qubits) using the method known as structural physical approximation. We also report its experimental implementation in linear optics. The scheme is optimal in that the maximal fidelity is attained, and also practical as measurement and preparation of quantum states that are experimentally feasible within current technologies are solely applied.
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Hyang-Tag Lim, Young-Sik Ra, Yong-Su Kim, Joonwoo Bae, and Yoon-Ho Kim "Physical implementation of non-physical quantum operations: realization of the universal transpose operation", Proc. SPIE 8163, Quantum Communications and Quantum Imaging IX, 816311 (6 September 2011); https://doi.org/10.1117/12.903885
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