2013 Fiscal Year Final Research Report
Experiental studies on quantum measurements using entanglement
| Project/Area Number |
23340119
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Atomic/Molecular/Quantum electronics
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| Research Institution | Gakushuin University |
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Principal Investigator |
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | スクイーズ光 / エンタングルメント / パラメトリック増幅 / 周期分極反転光導波路 / パルス光 / 量子測定 / 量子鍵配送 |
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| Research Abstract |
We experimentally investigate the temporal characteristics of picosecond squeezed pulses generated via an optical parametric amplification in a periodically poled MgO:LiNbO_3 waveguide. The noise variances for the various time delays between the squeezed pulse and a local oscillator are measured using a balanced homodyne detector. The measured delay dependence is asymmetric, and this asymmetry indicates that the phase chirping of the squeezed pulse is different from that of the local oscillator pulse. We show that the observed squeezing can be improved by using the pulse shaping of the local oscillator. By using a temporally shaped local oscillator in a balanced homodyne detection, we obverved the squeezing of -5.0 dB below the shot noise level. To our best knowledge, this is the highest level obtained for waveguide squeezers.
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