Physical Review Letters

Controlling the Decoherence of a “Meter” via Stroboscopic Feedback

David Vitali, P. Tombesi, Gerard J Milburn

Published Sep 29, 1997• 94 citations

Abstract

We propose a simple modification of the experimental scheme employed by Brune et al. [Phys. Rev. Lett. 77, 4887 (1996)] for the generation and detection of a Schr"odinger cat state, in which the decoherence of the cat state can be significantly slowed down using an appropriate feedback.

DOI: 10.1103/physrevlett.79.2442

Related papers

Protecting schrödinger cat states using feedback

David Vitali, P. Tombesi, Gerard J Milburn

A feedback model based on direct photodetection and micromaser-like atomic injection is proposed for the preservation of quantum coherence in a cavity. We show that in this way it is possible to slow down significantly the decoherence of Schrödinger cat states.

Journal of Modern OpticsNov 1, 19976 citations

Creating Metastable Schrödinger Cat States

John J. Slosser, Gerard J Milburn

We propose a scheme using feedback to generate a macroscopic quantum superposition of coherent states in an optical cavity mode which experiences very little decoherence (due to dissipation).Received 9 November 1994DOI:https://doi.org/10.1103/PhysRevLett.75.418©1995 American Physical Society

Physical Review LettersJul 17, 199519 citations

A Scheme for Preparing Schrödinger Cat States with Controllable Manners

Guo Guang-Can, Zheng Shi-Biao

A scheme to generate superpositions of coherent states with variable amplitudes, phases and weighting factors is proposed. It provides experimental possibility for preparing an arbitrary Schrödinger cat state.

Chinese Physics LettersJun 1, 19971 citation

Effect of feedback on the decoherence of a Schrödinger-cat state: A quantum trajectory description

Peter Goetsch, Paolo Tombesi, David Vitali

The linear stochastic Schr\"odinger equation of a cavity mode subject to a homodyne measurement and to a phase-sensitive feedback loop realized with part of the output homodyne photocurrent is derived. We show that quantum feedback has stabilizing effects which manifest themselves in a significant retardation of the decoherence of a Schr\"odinger-cat state. \textcopyright{} 1996 The American Physical Society.

Physical Review ANov 1, 199652 citations

All-Optical Model for the Generation and the Detection of Macroscopic Quantum Coherence

P. Tombesi, David Vitali

We show that with a suitable modification of the model proposed by Yurke, Schleich, and Walls [Phys. Rev. A 42, 1703 (1990)] for the generation of linear superpositions of macroscopically distinct quantum states, it is possible to arrange a scheme for generating and detecting optical Schr\"odinger catlike states which is experimentally feasible with current technologies.

Physical Review LettersJul 15, 199618 citations

Autofeedback model for Schrodinger cat preservation

Mauro Fortunato, P. Tombesi, David Vitali +1 more

Summary form only given. Decoherence, i.e., the rapid destruction of the phase relation between two quantum states of a system caused by the entanglement of these two states with two different states of the environment, is the main limiting factor for quantum information processing. For this reason decoherence control is now becoming a rapidly expanding field of investigation. The progressive decoherence of a mesoscopic Schrodinger cat state has been observed for the first time in the experiment of Brune et al where the linear superposition of two coherent states of a field in a microwave cavity, with classically distinct phases, has been generated and detected.

Quantum Electronics and Laser Science ConferenceJan 20, 20030 citations