Qubit state monitoring by measurement of three complementary observables

Details Qubit state monitoring by measurement of three complementary observables Qubit state monitoring by measurement of three complementary observables

2010-06-10

arxiv.org/abs/1006.2013v1

Phys. Rev. Lett. 105, 100506 (2010)

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.105.100506

We consider the evolution of a spin 1/2 (qubit) under the simultaneous continuous measurement of three non-commuting qubit operators sigma_x, sigma_y, sigma_z. For identical ideal detectors the qubit state evolves by approaching a pure state with a random direction in the Bloch vector space and by undergoing locally isotropic diffusion in the perpendicular directions. The quantum state conditioned on the complete detector record is used to assess the fidelity of classically inspired estimates based on running time averages and discrete time bin detector outputs.

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