Measurement operator for quantum nondemolition measurements
| Autor: | Ebubechukwu O. Ilo-Okeke, Ping Chen, Shuang Li, Bede C. Anusionwu, Valentin Ivannikov, Tim Byrnes |
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| Rok vydání: | 2023 |
| Předmět: |
Quantum Physics
Computational Theory and Mathematics Computer Networks and Communications FOS: Physical sciences Electrical and Electronic Engineering Physical and Theoretical Chemistry Condensed Matter Physics Quantum Physics (quant-ph) Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials |
| DOI: | 10.48550/arxiv.2301.05910 |
| Popis: | We derive a measurement operator corresponding to a quantum nondemolition (QND) measurement of an atomic ensemble. The quantum measurement operator takes the form of a positive operator valued measure (POVM) and is valid for arbitrary interaction times, initial coherent state amplitudes, and final photon measurement outcomes. We analyze the dependence on various parameters and show that the effect of the QND measurement for short interaction times is to apply a Gaussian modulation of the initial state wavefunction. We derive approximate expressions for the POVM in various limits, such as the short interaction time regime and projective measurement limit. Several examples are shown, which show how spin squeezing and Schrodinger cat states can be generated using the measurement. |
| Databáze: | OpenAIRE |
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