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Related Experiment Video

Updated: May 13, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Progressive field-state collapse and quantum non-demolition photon counting.

Christine Guerlin¹, Julien Bernu, Samuel Deléglise

¹Laboratoire Kastler Brossel, Ecole Normale Supérieure, CNRS, Université Pierre et Marie Curie, 24 rue Lhomond, 75231 Paris Cedex 05, France.

|August 24, 2007

Summary

This summary is machine-generated.

Researchers observed step-by-step quantum state collapse by non-destructively measuring photon number in a cavity. This progressive measurement reveals the fundamental quantum measurement process and aids in studying non-classical fields.

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Area of Science:

Quantum Mechanics
Quantum Optics
Atomic Physics

Background:

Quantum measurement theory describes irreversible system evolution and state collapse.
State collapse can be a progressive process, accumulating elementary changes.
Observing step-by-step collapse is crucial for understanding quantum measurement.

Purpose of the Study:

To experimentally observe progressive quantum state collapse.
To non-destructively measure the photon number of a cavity field.
To illustrate the postulates of quantum measurement.

Main Methods:

Utilized atoms as microscopic clocks to probe a cavity field.
Measured light-induced alterations in atomic clock rates.
Analyzed correlations between repeated measurements to demonstrate photon number spread suppression.

Main Results:

Observed a step-by-step collapse of the photon number state.
Demonstrated progressive information extraction about the photon number.
Confirmed convergence of the photon number to an integer value.
Showcased suppression of photon number uncertainty through correlations.

Conclusions:

The experiment provides direct observation of progressive quantum state collapse.
The method illustrates key quantum measurement postulates: state collapse, statistical outcomes, and repeatability.
This technique can advance the study of non-classical fields in optical cavities.