Mechanically detecting and avoiding the quantum fluctuations of a microwave field
Quantum fluctuations of the light field used for continuous position detection produce stochastic back-action forces and ultimately limit the sensitivity. To overcome this limit, the back-action forces can be avoided by giving up complete knowledge of the motion, and these types of measurements are...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 2014-06, Vol.344 (6189), p.1262-1265 |
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| container_issue | 6189 |
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| container_title | Science (American Association for the Advancement of Science) |
| container_volume | 344 |
| creator | Suh, J. Weinstein, A. J. Lei, C. U. Wollman, E. E. Steinke, S. K. Meystre, P. Clerk, A. A. Schwab, K. C. |
| description | Quantum fluctuations of the light field used for continuous position detection produce stochastic back-action forces and ultimately limit the sensitivity. To overcome this limit, the back-action forces can be avoided by giving up complete knowledge of the motion, and these types of measurements are called "back-action evading" or "quantum nondemolition" detection. We present continuous two-tone back-action evading measurements with a superconducting electromechanical device, realizing three long-standing goals: detection of back-action forces due to the quantum noise of a microwave field, reduction of this quantum back-action noise by 8.5 ± 0.4 decibels (dB), and measurement imprecision of a single quadrature of motion 2.4 ± 0.7 dB below the mechanical zero-point fluctuations. Measurements of this type will find utility in ultrasensitive measurements of weak forces and nonclassical states of motion. |
| doi_str_mv | 10.1126/science.1253258 |
| format | Article |
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We present continuous two-tone back-action evading measurements with a superconducting electromechanical device, realizing three long-standing goals: detection of back-action forces due to the quantum noise of a microwave field, reduction of this quantum back-action noise by 8.5 ± 0.4 decibels (dB), and measurement imprecision of a single quadrature of motion 2.4 ± 0.7 dB below the mechanical zero-point fluctuations. 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| ispartof | Science (American Association for the Advancement of Science), 2014-06, Vol.344 (6189), p.1262-1265 |
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| source | American Association for the Advancement of Science; Jstor Complete Legacy |
| subjects | Calibration Circuits Damping Fluctuation Microwave resonance Microwaves Miniature Monitors Noise measurement Oscillators Pumps Quantum mechanics Quantum physics Quantum theory Resonators Sidebands Superconductivity Thermometers Transition zones |
| title | Mechanically detecting and avoiding the quantum fluctuations of a microwave field |
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