Looking for introduction on QND: quantum non-demolition measurements

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SUMMARY

This discussion focuses on quantum non-demolition (QND) measurements, particularly in the context of single photon experiments. QND measurements allow for the observation of quantum states without destroying them, which is a significant advancement in quantum mechanics. The term "non-demolition" refers to the ability to measure a quantum system without altering its state, enabling repeated measurements. The referenced paper on arXiv provides further insights into the mechanisms and implications of these measurements.

PREREQUISITES
  • Understanding of quantum mechanics principles
  • Familiarity with photon behavior and properties
  • Knowledge of measurement theory in quantum physics
  • Basic comprehension of experimental physics methodologies
NEXT STEPS
  • Read the paper "Quantum Non-Demolition Measurements" available on arXiv
  • Explore the concept of "quantum state preservation" in QND measurements
  • Investigate the implications of QND measurements on quantum computing
  • Learn about the experimental setups used in QND photon measurements
USEFUL FOR

Physicists, quantum mechanics researchers, and students interested in advanced measurement techniques and their applications in quantum technology.

lalbatros
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I just read a news on physicsweb:

http://physicsweb.org/articles/news/11/3/9"

This is called a "quantum non-demolition (QND) measurement on single photons".

I would like to know a little bit more about QNDs.
Why they are called so.
What is special about these QND experiments, or maybe paradoxal (I guess nothing).
Why this single photon experiment is called a QND.
Why it is possible to -apparently- observe a single photon without destroying it.
If and how the photon observed in this experiment has been perturbed?
I guess that non-demolition does not mean non-interaction ...

Web sites, papers, comments, ideas, ... welcome.

Michel
 
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Physics news on Phys.org

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