Autofeedback Scheme for Schrödinger Cat Preservation in Microwave Cavities

Fortunato, Mauro; Tombesi, Paolo; Vitali, David; Raimond, Jean‐Michel

doi:10.1002/(sici)1521-3978(200005)48:5/7<431::aid-prop431>3.0.co;2-3

Cited by 1 publication

(1 citation statement)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Whenever the cat parity changes, an atom is sent into the cavity, interacts resonantly with it and emits a photon in the mode, restoring the parity. Numerical simulations show that a cat state's coherence could be preserved, by this quantum feedback procedure, over times of the order of T c [34,35] As soon as we give up to monitor parity jumps, the field is described by a density operator ρ, obtained by averaging Monte Carlo trajectories. After a time of the order of τ D = 1/nκ there are statistically as many trajectories with even or odd click numbers.…”

Section: Parity Jumps Of a π-Phase Catmentioning

confidence: 99%

Monitoring the Decoherence of Mesoscopic Quantum Superpositions in a Cavity

Raimond

Haroche

2006

Quantum Decoherence

View full text Add to dashboard Cite

Abstract. Decoherence is an extremely fast and efficient environment-induced process transforming macroscopic quantum superpositions into statistical mixtures. It is an essential step in quantum measurement and a formidable obstacle for a practical use of quantum superpositions (quantum computing for instance). For large objects, decoherence is so fast that its dynamics is unobservable. Mesoscopic fields stored in a high-quality superconducting millimeter-wave cavity, a modern equivalent to Einstein's 'photon box', are ideal tools to reveal the dynamics of the decoherence process. Their interaction with a single circular Rydberg atom prepares them in a quantum superposition of fields, containing a few photons, with different classical phases. The evolution of this 'Schrödinger cat' state can be later probed with a 'quantum mouse', another atom, assessing its coherence. We describe here the experiments performed along these lines at ENS, and stress the deep links between decoherence and complementarity.

show abstract

Section: Parity Jumps Of a π-Phase Catmentioning

confidence: 99%