Energetic Suppression of Decoherence in Exchange-Only Quantum Computation

Details Energetic Suppression of Decoherence in Exchange-Only Quantum Computation Energetic Suppression of Decoherence in Exchange-Only Quantum Computation

2004-08-05

arxiv.org/abs/quant-ph/0408037v1

Phys. Rev. A, 72, 022319 (2005)

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevA.72.022319

Universal quantum computation requiring only the Heisenberg exchange interaction and suppressing decoherence via an energy gap is presented. The combination of an always-on exchange interaction between the three physical qubits comprising the encoded qubit and a global magnetic field generates an energy gap between the subspace of interest and all other states. This energy gap suppresses decoherence. Always-on exchange couplings greatly simplify hardware specifications and the implementation of inter-logical-qubit gates. A controlled phase gate can be implemented using only three Heisenberg exchange operations all of which can be performed simultaneously.

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