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- W3037334511 abstract "It is not possible to disentangle a qubit in an unknown state $|ensuremath{psi}〉$ from a set of $Nensuremath{-}1$ ancilla qubits prepared in a specific reference state $|0〉.$ That is, it is not possible to perfectly perform the transformation $(|ensuremath{psi},0,dots{},0〉+|0,ensuremath{psi},dots{},0〉+ensuremath{cdot}ensuremath{cdot}ensuremath{cdot}+|0,0,dots{},ensuremath{psi}〉)ensuremath{rightarrow}|0,dots{},0〉ensuremath{bigotimes}|ensuremath{psi}〉.$ The question is then how well we can do? We consider a number of different methods of extracting an unknown state from an entangled state formed from that qubit and a set of ancilla qubits in a known state. Measuring the whole system is, as expected, the least effective method. We present various quantum ``devices'' which disentangle the unknown qubit from the set of ancilla qubits. In particular, we present the optimal universal disentangler which disentangles the unknown qubit with a fidelity that does not depend on the state of the qubit, and a probabilistic disentangler which performs the perfect disentangling transformation, but with a probability less than 1." @default.
- W3037334511 created "2020-07-02" @default.
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- W3037334511 date "2000-10-11" @default.
- W3037334511 modified "2023-10-17" @default.
- W3037334511 title "Quantum disentanglers" @default.
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- W3037334511 doi "https://doi.org/10.1103/physreva.62.052303" @default.
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