1301.2808 (E. C. Behrman et al.)

A quantum neural network computes its own relative phase    [PDF]

E. C. Behrman, J. E. Steck

Complete characterization of the state of a quantum system made up of subsystems requires determination of relative phase, because of interference effects between the subsystems. For a system of qubits used as a quantum computer this is especially vital, because the entanglement, which is the basis for the quantum advantage in computing, depends intricately on phase. We present here a first step towards that determination, in which we use a two-qubit quantum system as a quantum neural network, which is trained to compute and output its own relative phase.

View original: http://arxiv.org/abs/1301.2808