| The experiment is a unique demonstration of a phenomenon known as quantum nondemolition. |
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| Finally, using resonance fluorescence by means of a cyclic transition, quantum nondemolition measurements of the qubit can be realized. |
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| Several devices are designed and a two-mode quantum nondemolition detection is introduced to obtain the desired state. |
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| 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. |
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| Aharonov and others are exploring the possibility that there could be nondemolition measurements that could extract information from a quantum state without collapsing it. |
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