Physics – Quantum Physics
Scientific paper
2005-03-16
Physics
Quantum Physics
TR apologises for yet again finding a coauthor with a ridiculous middle name [12]
Scientific paper
10.1088/1367-2630/7/1/228
We prove that universal quantum computation is possible using only (i) the physically natural measurement on two qubits which distinguishes the singlet from the triplet subspace, and (ii) qubits prepared in almost any three different (potentially highly mixed) states. In some sense this measurement is a `more universal' dynamical element than a universal 2-qubit unitary gate, since the latter must be supplemented by measurement. Because of the rotational invariance of the measurement used, our scheme is robust to collective decoherence in a manner very different to previous proposals - in effect it is only ever sensitive to the relational properties of the qubits.
Rudolph Terry
Virmani Shashank Soyuz
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