Characterization of a quasistatic environment with a qubit
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2019-06-20 |
| Journal | Physical review. A/Physical review, A |
| Authors | Fattah Sakuldee, Åukasz CywiÅski |
| Institutions | Polish Academy of Sciences, Institute of Physics |
| Citations | 8 |
Abstract
Section titled āAbstractāWe consider a qubit initalized in a superposition of its pointer states,\nexposed to pure dephasing due to coupling to a quasi-static environment, and\nsubjected to a sequence of single-shot measurements projecting it on chosen\nsuperpositions. We show how with a few of such measurements one can\nsignificantly diminish oneās ignorance about the environmental state, and how\nthis leads to increase of coherence of the qubit interacting with a properly\npost-selected environmental state. We give theoretical results for the case of\na quasi-static environment that is a source of an effective field of Gaussian\nstatistics acting on a qubit, and for a nitrogen-vacancy center qubit coupled\nto a nuclear spin bath, for which the Gaussian model applies qualitatively\nprovided one excludes from the environment nuclei that are strongly coupled to\nthe qubit. We discuss the reason for which the most probable sequences of\nmeasurement results are the ones consisting of identical outcomes, and in this\nway we shed light on recent experiment (D. D. Bhaktavatsala Rao et al.,\narXiv:1804.07111) on nitrogen-vacancy centers.\n
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal SourceāReferences
Section titled āReferencesā- 2007 - Decoherence and the Quantum-to-Classical Transition
- 2010 - Quantum Measurement and Control