Picture of virus under microscope

Research under the microscope...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

Explore SIPBS research

Freezing coherent field growth in a cavity by the quantum zeno effect

Bernu, J. and Deleglise, S. and Sayrin, C. and Kuhr, S. and Dotsenko, I. and Brune, M. and Raimond, J. M. and Haroche, S. (2008) Freezing coherent field growth in a cavity by the quantum zeno effect. Physical Review Letters, 101 (18). ISSN 0031-9007

Full text not available in this repository. (Request a copy from the Strathclyde author)

Abstract

We have frozen the coherent evolution of a field in a cavity by repeated measurements of its photon number. We use circular Rydberg atoms dispersively coupled to the cavity mode for an absorption-free photon counting. These measurements inhibit the growth of a field injected in the cavity by a classical source. This manifestation of the quantum Zeno effect illustrates the backaction of the photon number determination onto the field phase. The residual growth of the field can be seen as a random walk of its amplitude in the two-dimensional phase space. This experiment sheds light onto the measurement process and opens perspectives for active quantum feedback.