2018 Fiscal Year Annual Research Report
Optical implementation of two-qubit nonlocal generalized quantum measurement
| Project/Area Number |
18J10639
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| Research Institution | Tohoku University |
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Principal Investigator |
Vidil Pierre 東北大学, 工学研究科, 特別研究員(DC2)
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| Project Period (FY) |
2018-04-25 – 2020-03-31
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| Keywords | quantum measurement / quantum nonlocality / quantum entanglement / quantum optics |
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| Outline of Annual Research Achievements |
On the theoretical side, we have found a way to improve the efficiency of our nonlocal measurement scheme while reducing the disturbance induced by the interaction. It turns out that in the non-strong measurement regime, nonlocal observables can be measured without using maximally-entangled states. The results exhibiting the relation between the measurement strength and the necessary amount of entanglement have been compiled in a paper, which is to be submitted for publication in the near future.
On the experimental side, a new cryostat system which will be used for high-efficiency superconductive photon detectors has been delivered and installed. Elements needed for the stabilization of the optical setup also have been set up, and the high-speed electro-optical switches that will implement the measurement interactions are also ready. The experiment can now enter its final phase with results hopefully in the coming year.
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
The cryostat which we first planned to use broke down unexpectedly around May of last year, leading to a significant delay regarding the installation of the photon detectors.
In the meantime however, significant progress has been made on the theoretical aspects of this project.
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| Strategy for Future Research Activity |
This research will now enter its final phase with the actual measurement of nonlocal observables on a pair of qubits, using the source and the detectors that have been installed. The final goal is to be able to compare different measurement strategies over a broad range of measurement strengths in order to compare them.
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