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Optical pumping and readout of bismuth hyperfine states in silicon for atomic clock applications
The push for a semiconductor-based quantum information technology has renewed interest in the spin states and optical transitions of shallow donors in silicon, including the donor bound exciton transitions in the near-infrared and the Rydberg, or hydrogenic, transitions in the mid-infrared. The deepest group V donor in silicon, bismuth, has a large zero-field ground state hyperfine splitting, comparable to that of rubidium, upon which the now-ubiquitous rubidium atomic clock time standard is based. Here we show that the ground state hyperfine populations of bismuth can be read out using the mid-infrared Rydberg transitions, analogous to the optical readout of the rubidium ground state populations upon which rubidium clock technology is based. We further use these transitions to demonstrate strong population pumping by resonant excitation of the bound exciton transitions, suggesting several possible approaches to a solid-state atomic clock using bismuth in silicon, or eventually in enriched 28Si
On the fundamental role of dynamics in quantum physics
Quantum theory expresses the observable relations between physical properties
in terms of probabilities that depend on the specific context described by the
"state" of a system. However, the laws of physics that emerge at the
macroscopic level are fully deterministic. Here, it is shown that the relation
between quantum statistics and deterministic dynamics can be explained in terms
of ergodic averages over complex valued probabilities, where the fundamental
causality of motion is expressed by an action that appears as the phase of the
complex probability multiplied with the fundamental constant hbar. Importantly,
classical physics emerges as an approximation of this more fundamental theory
of motion, indicating that the assumption of a classical reality described by
differential geometry is merely an artefact of an extrapolation from the
observation of macroscopic dynamics to a fictitious level of precision that
does not exist within our actual experience of the world around us. It is
therefore possible to completely replace the classical concepts of trajectories
with the more fundamental concept of action phase probabilities as a
universally valid description of the deterministic causality of motion that is
observed in the physical world.Comment: More compact version set in RevTex (15 pages), overview of the paper
added to the introduction, along with additional explanations of the relation
between statistics and the action of deterministic transformations in section
II. Final version for publication in The European Physical Journal