Quantum Computing in the Presence of Detected Spontaneous Emission

摘要

A new method for quantum computation in the presence of detected spontaneousemission is proposed. The method combines strong and fast (dynamicaldecoupling) pulses and a quantum error correcting code that encodes $n$ logicalqubits into only $n+1$ physical qubits. Universal fault-tolerant quantumcomputation is shown to be possible in this scheme using Hamiltonians relevantto a range of promising proposals for the physical implementation of quantumcomputers.