Constraints for quantum logic arising from conservation laws and field fluctuations

Details Constraints for quantum logic arising from conservation laws and field fluctuations Constraints for quantum logic arising from conservation laws and field fluctuations

2005-07-26

arxiv.org/abs/quant-ph/0507251v1

Physics

Quantum Physics

To appear in J. Opt. B: Quantum Semiclass. Opt., special issue on quantum control

Scientific paper

10.1088/1464-4266/7/10/017

We explore the connections between the constraints on the precision of quantum logical operations that arise from a conservation law, and those arising from quantum field fluctuations. We show that the conservation-law based constraints apply in a number of situations of experimental interest, such as Raman excitations, and atoms in free space interacting with the multimode vacuum. We also show that for these systems, and for states with a sufficiently large photon number, the conservation-law based constraint represents an ultimate limit closely related to the fluctuations in the quantum field phase.

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