Quantum property of EIT memory from the view point of M&P

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A squeezed vacuum is a non-classical light, whose quantum deviation becomes small along uncertainly principle. Therefore it is considered as one of quantum-information carriers. This study representative had already succeeded in storage and retrieval of that light, and he has succeeded in improvement of it.He has also succeeded in storage and retrieval of a squeezed vacuum of a beet mode. This technique makes the measured deviation be high frequency, and allows us to observe it without the environment noise.