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A macroscopic quantum state is a state of matter in which macroscopic properties, such as mechanical motion,〔A. D. O’Connell, M. Hofheinz, M. Ansmann, R. C. Bialczak, M. Lenander, E. Lucero, M. Neeley, D. Sank, H. Wang, M. Weides, J. Wenner, J. M. Martinis, and A. N. Cleland. Quantum ground state and single-phonon control of a mechanical resonator. Nature, 464:697–703, April 2010.〕 thermal conductivity, electrical conductivity〔M. Ansmann, H. Wang, R. C. Bialczak, M. Hofheinz, E. Lucero, M. Neeley, A. D. O’Connell, D. Sank, M. Weides, J. Wenner, A. N. Cleland, John M. Martinis. Violation of Bell’s inequality in Josephson phase qubits. Nature, 461:504-506 September 2009.〕 and viscosity, can be described only by quantum mechanics rather than merely classical mechanics. This occurs primarily at low temperatures where there is little thermal motion present to mask the quantum nature of a substance. Macroscopic quantum phenomena can emerge from coherent states of superfluids and superconductors. Quantum states of motion have been directly observed in a macroscopic mechanical resonator (see quantum machine). ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Macroscopic quantum state」の詳細全文を読む スポンサード リンク
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