| Project/Area Number |
20740230
|
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Atomic/Molecular/Quantum electronics
|
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| Research Institution | Gunma University |
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Principal Investigator |
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| Project Period (FY) |
2008 – 2011
|
| Project Status |
Completed (Fiscal Year 2011)
|
| Budget Amount *help |
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2010: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2009: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2008: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
|
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| Keywords | 量子情報 / 量子コンピュータ / 量子暗号 / 量子測定 |
|---|
| Research Abstract |
In this study, we proposed a new reversing operation, referred to as conjugate measurement, on the quantum state of a system disturbed by a reversible measurement. It can approximately recover the original state especially with an additional information gain, while the conventional reversing operation known as the reversing measurement perfectly recovers the original state with completely erasing the information obtained by the first measurement. Moreover, we evaluated the amount of information gain, the degree of state change, and the degree of physical reversibility to show tradeoffs among them for various classes of measurements.
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