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Unconditional quantum-noise suppression via measurement-based quantum feedback
Ryotaro Inoue, Shin-Ichi-Ro Tanaka, Ryo Namiki +2
We demonstrate unconditional quantum-noise suppression in a collective spin system via feedback control based on quantum non-demolition measurement (QNDM). We perform shot-noise li…
Manipulation of Non-classical Atomic Spin States
Tetsushi Takano, Shin-Ichi-Ro Tanaka, Ryo Namiki +1
We report successful manipulation of non-classical atomic spin states. We generate squeezed spin states by a spin quantum nondemolition measurement, and apply an off-resonant circu…
Spin squeezing of a cold atomic ensemble with the nuclear spin of one-half
T. Takano, M. Fuyama, R. Namiki +1
To establish an applicable system for advanced quantum information processing between light and atoms, we have demonstrated the quantum non-demolition (QND) measurement with a coll…