期刊
NEW JOURNAL OF PHYSICS
卷 19, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/aa8438
关键词
atomic ensembles; squeezing; optical cavity
资金
- Carlsberg Foundation
- European Research Council under the European Union's Seventh Framework Programme through ERC Grant QIOS [306576]
- ERC [337603]
- Danish Council for Independent Research (Sapere Aude)
- Qubiz-Quantum Innovation Center
- VILLUM FONDEN via the QMATH Centre of Excellence [10059]
- National Science Foundation
- Hertz Foundation
- Alfred P. Sloan Foundation
- AFOSR
- Villum Fonden [00010059] Funding Source: researchfish
- Division Of Physics
- Direct For Mathematical & Physical Scien [1506401] Funding Source: National Science Foundation
- European Research Council (ERC) [337603] Funding Source: European Research Council (ERC)
The strong light-matter coupling attainable in optical cavities enables the generation of highly squeezed states of atomic ensembles. It was shown by Sorensen and Molmer (2002 Phys. Rev. A 66 022314) how an effective one-axis twisting Hamiltonian can be realized in a cavity setup. Here, we extend this work and show how an effective two-axis twisting Hamiltonian can be realized in a similar cavity setup. We compare the two schemes in order to characterize their advantages. In the absence of decoherence, the two-axis Hamiltonian leads to more squeezing than the one-axis Hamiltonian. If limited by decoherence from spontaneous emission and cavity decay, we find roughly the same level of squeezing for the two schemes scaling as root NC where C is the single atom cooperativity and Nis the total number of atoms. When compared to an ideal squeezing operation, we find that for specific initial states, a dissipative version of the one-axis scheme attains higher fidelity than the unitary one-axis scheme or the two-axis scheme. However, the unitary one-axis and two-axis schemes perform better for general initial states.
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