Physics – Quantum Physics
Scientific paper
2008-02-29
Phys. Rev. Lett. 103, 020506 (2009)
Physics
Quantum Physics
5 pages, 2 figures, comments welcome; v2 has had many technical detailed removed, and gives a simplified presentation; v3 publ
Scientific paper
10.1103/PhysRevLett.103.020506
Quantum computation can proceed solely through single-qubit measurements on an appropriate quantum state, such as the ground state of an interacting many-body system. We investigate a simple spin-lattice system based on the cluster-state model, and by using nonlocal correlation functions that quantify the fidelity of quantum gates performed between distant qubits, we demonstrate that it possesses a quantum (zero-temperature) phase transition between a disordered phase and an ordered "cluster phase" in which it is possible to perform a universal set of quantum gates.
Bartlett Stephen D.
Doherty Andrew C.
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