Singlet states and the estimation of eigenstates and eigenvalues of an unknown Controlled-$U$ gate
| Autoři | |
|---|---|
| Rok publikování | 2001 |
| Druh | Článek v odborném periodiku |
| Časopis / Zdroj | Physical Review A |
| Fakulta / Pracoviště MU | |
| Citace | |
| Obor | Informatika |
| Klíčová slova | QUANTUM |
| Popis | We consider several problems that involve finding the eigenvalues and generating the eigenstates of unknown unitary gates. We first examine controlled-U gates that act on qubits and assume that we know the eigenvalues. It is then shown how to use singlet states to produce qubits in the eigenstates of the gate. We then remove the assumption that we know the eigenvalues and show how to both find the eigenvalues and produce qubits in the eigenstates. Finally. we look at the case where the unitary operation acts on qutrits and it has two eigenvalues of 1 and one of - 1. We are able to use a singlet state to produce a qutrit in the eigenstate corresponding to the - 1 eigenvalue. |
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