| The experiment is a unique demonstration of a phenomenon known as quantum nondemolition. |
| Finally, using resonance fluorescence by means of a cyclic transition, quantum nondemolition measurements of the qubit can be realized. |
| Aharonov and others are exploring the possibility that there could be nondemolition measurements that could extract information from a quantum state without collapsing it. |
| Now a team at the Ecole Normale Supérieure in Paris has used a clever trick to observe a single photon, and then observed it again, confirming that they had achieved quantum nondemolition. |
| Several devices are designed and a two-mode quantum nondemolition detection is introduced to obtain the desired state. |
