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Quantum Rotation Sensing with Dual Sagnac Interferometers in an Atom-Optical Waveguide
摘要： We describe a Sagnac interferometer suitable for rotation sensing, implemented using an atomic Bose-Einstein condensate confined in a harmonic magnetic trap. The atom wave packets are split and recombined by standing-wave Bragg lasers, and the trapping potential steers the packets along circular trajectories with a radius of 0.2 mm. Two conjugate interferometers are implemented simultaneously to provide common-mode rejection of noise and to isolate the rotation signal. With interference visibilities of about 50%, we achieve a rotation sensitivity comparable to Earth’s rate in about 10 min of operation. Gyroscope operation was demonstrated by rotating the optical table on which the experiment was performed.
关键词： Sagnac Interferometers,Quantum Rotation Sensing,Rotation Sensitivity,Atom-Optical Waveguide,Bose-Einstein Condensate
更新于2025-09-23 15:21:01
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Direct imaging of direction-controlled molecular rotational wave packets created by a polarization-skewed double-pulse
摘要： High‐precision, time‐resolved Coulomb explosion imaging of rotational wave packets in nitrogen molecules created with a pair of time‐delayed, polarization‐skewed femtosecond laser pulses is presented, providing insight into creation process and dynamics of direction‐controlled wave packet. To initiate unidirectional rotation, the interval of the double‐pulse was set so that the second, polarization‐tilted pulse hit the molecules at the time when molecules were aligned or antialigned along the polarization vector of the first pulse. During the revival period of the rotational wave packet, pulse intervals around both the full and half revival times were used. The observed molecular wave packet movies clearly show signatures of quantum rotation such as angular localization (alignment), dispersion, and revival phenomena during the unidirectional motion. The patterns are quite different depending on the pulse interval even when angular distribution at the second pulse irradiation is similar. The observed interval‐dependence of the dynamics was analyzed on the basis of the real‐time images, with an aid of numerical simulations, and the creation process of the packets were discussed. We show the observed image patterns can be essentially rationalized in terms of rotational period and alignment parameter. Because the double‐pulse scheme is the most fundamental in the creation of direction‐controlled rotational wave packets, this study will lead to more sophisticated control and characterization of directional molecular motions.
关键词： rotational wave packets,Coulomb explosion imaging,quantum rotation,femtosecond laser pulses,unidirectional rotation
更新于2025-09-23 15:19:57