Fault-tolerant linear optical quantum computing with small-amplitude coherent States.
Quantum computing using two coherent states as a qubit basis is a proposed alternative architecture with lower overheads but has been questioned as a practical way of performing quantum computing due to the fragility of diagonal states with large coherent amplitudes. We show that using error correction only small amplitudes (alpha>1.2) are required for fault-tolerant quantum computing. We study fault tolerance under the effects of small amplitudes and loss using a Monte Carlo simulation. The first encoding level resources are orders of magnitude lower than the best single photon scheme.
Lund
A P
AP
Centre for Quantum Computer Technology, Department of Physics, University of Queensland, St. Lucia, QLD 4072, Australia. lund@physics.uq.edu.au
Ralph
T C
TC
Haselgrove
H L
HL