Fault-Tolerant Quantum Computation via Exchange interactions

Details Fault-Tolerant Quantum Computation via Exchange interactions Fault-Tolerant Quantum Computation via Exchange interactions

2004-06-25

arxiv.org/abs/quant-ph/0406198v1

Phys. Rev. Lett. 94, 040507 (2005)

Physics

Quantum Physics

5 pages, including 1 figure

Scientific paper

10.1103/PhysRevLett.94.040507

Quantum computation can be performed by encoding logical qubits into the states of two or more physical qubits, and controlling a single effective exchange interaction and possibly a global magnetic field. This "encoded universality" paradigm offers potential simplifications in quantum computer design since it does away with the need to perform single-qubit rotations. Here we show that encoded universality schemes can be combined with quantum error correction. In particular, we show explicitly how to perform fault-tolerant leakage correction, thus overcoming the main obstacle to fault-tolerant encoded universality.

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