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Full-Text Articles in Physics
Ultrasensitive Inverse Weak-Value Tilt Meter, Julián Martínez-Rincón, Christopher A. Mullarkey, Gerardo I. Viza, Wei-Tao Liu, John C. Howell
Ultrasensitive Inverse Weak-Value Tilt Meter, Julián Martínez-Rincón, Christopher A. Mullarkey, Gerardo I. Viza, Wei-Tao Liu, John C. Howell
Mathematics, Physics, and Computer Science Faculty Articles and Research
We present an interferometric technique for measuring ultrasmall tilts. The information of a tilt in one of the mirrors of a modified Sagnac interferometer is carried by the phase difference between the counter-propagating laser beams. Using a small misalignment of the interferometer, orthogonal to the plane of the tilt, a bimodal (or two-fringe) pattern is induced in the beam’s transverse power distribution. By tracking the mean of such a distribution, using a split detector, a sensitive measurement of the phase is performed. With 1.2 mW of continuous-wave laser power, the technique has a shot noise limited sensitivity of 56 frad/Hz−−−√ …
Practical Advantages Of Almost-Balanced-Weak-Value Metrological Techniques, Julián Martínez-Rincón, Zekai Chen, John C. Howell
Practical Advantages Of Almost-Balanced-Weak-Value Metrological Techniques, Julián Martínez-Rincón, Zekai Chen, John C. Howell
Mathematics, Physics, and Computer Science Faculty Articles and Research
Precision measurements of ultrasmall linear velocities of one of the mirrors in a Michelson interferometer are performed using two different weak-value techniques. We show that the technique of almost-balanced weak values (ABWV) offers practical advantages over the technique of weak-value amplification, resulting in larger signal-to-noise ratios and the possibility of longer integration times due to robustness to slow drifts. As an example of the performance of the ABWV protocol we report a velocity sensitivity of 60 fm/s after 40 h of integration time. The sensitivity of the Doppler shift due to the moving mirror is 150 nHz.
Slow Light In Flight Imaging, Kali Wilson, Bethany Little, Genevieve Gariepy, Robert Henderson, John C. Howell, Daniele Faccio
Slow Light In Flight Imaging, Kali Wilson, Bethany Little, Genevieve Gariepy, Robert Henderson, John C. Howell, Daniele Faccio
Mathematics, Physics, and Computer Science Faculty Articles and Research
Slow-light media are of interest in the context of quantum computing and enhanced measurement of quantum effects, with particular emphasis on using slow light with single photons. We use light-in-flight imaging with a single-photon avalanche diode camera array to image in situ pulse propagation through a slow-light medium consisting of heated rubidium vapor. Light-in-flight imaging of slow-light propagation enables direct visualization of a series of physical effects, including simultaneous observation of spatial pulse compression and temporal pulse dispersion. Additionally, the single-photon nature of the camera allows for observation of the group velocity of single photons with measured single-photon fractional delays …