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The basic requirements for these experiments is reduction of the thermal decoherence rate, i.e. the inverse time of the absorption of a phonon from the environment, under the mechanical resonance. When suspended massive mirror is used, thermal decoherence can be reduced by optically trapping the mirror&＃39;s motion because high-frequency laser is almost in its ground state with low entropy, and can create an effectively zero-temperature thermal bath even at room temperature. This optical control of a macroscopic oscillator is stably achieved by using a triangular optical cavity [3]. I try to cool the mg-scale suspended mirror down to its motional ground state, and keep the state over one mechanical period by reducing the thermal decoherence rate. [1] W. Marshall, C. Simon, R. Penrose, and D. Bouwmeester, "Towards Quantum Superpositions of a Mirror", Phys. Rev. Lett. 91, 130401 (2003). [2] I. Pikovski, M. R. Vanner, M. Aspelmeyer, M. S. Kim, and C. Brukner, "Probing Planck-scale physics with quantum optics", Nat. Phys. 8, 393 (2012). [3] N. Matsumoto, Y. Michimura, Y. Aso, and K. Tsubono, "Optically trapped mirror for reaching the standard quantum limit", Opt. Express 22, 12915 (2014). 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