2013 Fiscal Year Annual Research Report
| Project/Area Number |
12F02503
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
NORI FRANCO 独立行政法人理化学研究所, 創発物性科学研究センター, グループディレクター
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| Co-Investigator(Kenkyū-buntansha) |
LIAO Jieqiao 独立行政法人理化学研究所, 創発物性科学研究センター, 外国人特別研究員
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| Keywords | Circuit electromechanics / Nanomechamical resonators / Quantum entanglement / Quadratic optomechanics / Photon blockade / Quantum manipulation / Quantum information processing |
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| Research Abstract |
In FY 2013, my studies mainly focused on the following two topics :
i) Few-photon physics in quadratic optomechanical systems We studied single-photon emission and scattering in quadratic optomechanical systems. We calculated the spectrum, photon-phonon entanglement, and mechanical quadrature squeezing in the single-photon processes. In particular, we established the relationship between the spectral features and the system parameters. We also studied the steady-state photon statistics of a quadratic optomechanical cavity in the weak-driven regime. We examined the photon blockade by analytically and numerically evaluating the second-order correlation function of the cavity photons. The results show that, in the deep-resolved-sideband and single-photon strong-coupling regimes, the single-photon resonant driving will induce a photon blockade, which is limited by the thermal noise of the mechanical environment.
ii) Entangling two macroscopic mechanical mirrors in a two-cavity optomechanical system We proposed a simple method to generate quantum entanglement between two macroscopic mechanical resonators in a two-cavity optomechanical system. This entanglement is induced by the radiation pressure of a single photon hopping between the two cavities. Our results are analytical, so that the entangled states are explicitly shown. Up to local operations, these states are two-mode three-component states, and hence the degree of entanglement can be well quantified by the concurrence. By analyzing the system parameters, we found that, to achieve a maximum average entanglement, the system should work in the single-photon strong-coupling regime and the deep-resolved-sideband regime.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Current research progress moves forward as planed in the proposal.
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| Strategy for Future Research Activity |
The following research will focus on coherent manipulation of mechanical motion by proposing practical schemes based on new and physical mechanism. In addition, we will devote to exploring and exploiting probable applications of electromechanics in quantum information processing. There is no change in the research plan.
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