Frontier Research Institute for Interdisciplinary Sciences
Tohoku University


Nobuyuki Matsumoto

Nobuyuki Matsumoto

Assistant ProfessorInformation and Systems

Mentor Information
Keiichi Edamatsu (Research Institute of Electrical Communication)
Research Fields Optomechanics
Research Subjects
  • Optical cavity consisting of a movable mirror and fixed mirrors
  • Laser cooling and measurement-based feedback cooling
Academic Society Membership sical society
Research Outline  

Recently, experiments using high-Q massive mechanical oscillators have been proposed for testing quantum mechanics [1] and probing Planck scale physics [2]. 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'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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