| Project/Area Number |
12555008
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 展開研究 |
|---|
| Research Field |
Applied optics/Quantum optical engineering
|
|---|
| Research Institution | Hokkaido University |
|---|
Principal Investigator |
TAKEUCHI Shigeki Hokkaido Univ., Res. Inst. for Elect. Sci., Associate Professor, 電子科学研究所, 助教授 (80321959)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
HASEGAWA Toshio Mitsubishi Elect. Corp., Info. Tech. R&D Center, Researcher, 情報技術総合研究所, 研究員
SASAKI Keiji Hokkaido Univ., Res. Inst. for Elect. Sci., Professor, 電子科学研究所, 教授 (00183822)
|
|---|
| Project Period (FY) |
2000 – 2001
|
| Project Status |
Completed (Fiscal Year 2001)
|
| Budget Amount *help |
¥9,800,000 (Direct Cost: ¥9,800,000)
Fiscal Year 2001: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2000: ¥8,200,000 (Direct Cost: ¥8,200,000)
|
|---|
| Keywords | single photon / quantum cryptography / quantum information / quantum telecommunication / parametric fluorescence / photon / パラメトリック蛍光 / パウメトリック螢光 |
|---|
| Research Abstract |
Quantum information technology ( QIT ) is now attracting many people because of its functions that cannot be realized using conventional technologies. A single photon generator, that emits a single photon in each pulse, is indispensable device for the realization of QIT. Recent proposals had a problem that the average number of photons are less than 0.1 and too small for the real use.
In this research project, we aimed to realize a real single photon generator, which emits single photons with high probability. Our method is to control the fast gating shutter for the signal photons using the detection signals of control photons. Our goal we aimed in the proposal was as follows: The realization of single photon source with more than 10kHz repetition rate, and also the single photon should be localized with in 1ns time window.
In the 2-year-long project, we first performed the characterization of the twin photon beam source and also the design of the system of the single photon source. In the second year, we succeeded in the development of the 'high-speed high-transmittance optical shutter' and 'optical delay line with high-transmittance.' We had almost finished the construction of the whole experimental system, however, the sudden accident of the trouble of the pump Argon ion laser caused the delay of the experiment unfortunately. After the end of the project (2002.3), we continued this experiment partly supported by JST-PRESTO project. In conclusion, we succeeded to perform the experiment which clearly showed the highest probability (0.4) to create single photons in a pulse, and in the experiment we observed a very small timing fluctuation less than 1ns, those are the goal we aimed in the proposal.
|
