Physics – Quantum Physics
Scientific paper
2010-03-08
International Journal of Quantum Information, Vol. 8, No. 6 (2010) 1001-1012
Physics
Quantum Physics
10 pages, 7 figures, accepted to the fifth Conference on the Theory of Quantum Computation, Communication and Cryptography, 20
Scientific paper
We consider the problem of minimizing resources required for universal quantum computation using only projective measurements. The resources we focus on are observables, which describe projective measurements, and ancillary qubits. We show that the set of observables {Z \otimes X, (cos\theta)X + (sin\theta)Y all \theta \in [0, 2\pi)} with one ancillary qubit is universal for quantum computation. The set is simpler than a previous one in the sense that one-qubit projective measurements described by the observables in the set are ones only in the (X,Y) plane of the Bloch sphere. The proof of the universality immediately implies a simple set of observables that is approximately universal for quantum computation. Moreover, the proof implies a simple set of observables for preparing graph states efficiently.
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