arXiv subjects

Sheng-Zhe Wang

Publications and source records attributed to Sheng-Zhe Wang.

3 recordsLinked to original sources

arXiv2026

Compact Continuous Cold Atomic Beam from a Single Cell with 3D Cooling and Ultra-low Light Shift

We report a compact single-cell source of a continuous cold-atom beam with three-dimensional (3D) cooling. By integrating an off-axis moving optical molasses (OM) with a two-dimensional magneto-optical trap (MOT), we achieve simultaneous 3D cooling within a 50 mm interaction region. The source delivers a continuous flux up to 4.9(5)x10^9 atoms/s, with a transverse temperature of 94(5) microK, a longitudinal temperature as low as 231(65) microK, and a tunable mean velocity between 5 and 20 m/s. Custom in-vacuum mirrors integrate the reflective geometry for the off-axis OM beams with a 0.8 mm output aperture, ensuring stable alignment while suppressing stray light and fluorescence leakage. Ultra-low light shift and decoherence are verified via continuous Raman-Ramsey interferometry, yielding a light shift of -0.51(4)Hz and a typical fringe contrast of 90.85(30)% at a Raman separation of 100 mm (interrogation time of 8.70 ms). This compact continuous cold-atom beam source constitutes a practical building block for atomic-beam clocks and interferometers, enabling reduced aliasing noise together with improved sensitivity and accuracy for field applications.

physics.atom-ph↗

arXiv2026

Spectral-Domain Coherent Control of Broadband Raman Coupling in Atom Interferometry

The performance of atom interferometers is commonly limited by the finite spectral acceptance of atomic beam splitters and mirrors, which restricts efficient coupling to atoms with large Doppler shifts and reduces the usable atomic flux. Here, we demonstrate spectral-domain coherent control of Raman coupling by engineering its effective two-photon spectrum. By synthesizing multiple frequency components, the Raman interaction simultaneously addresses a broad range of atomic velocities, effectively overcoming the conventional transit-time-limited linewidth. Implemented in a continuous atomic-beam Mach-Zehnder interferometer, where the transverse Doppler broadening is 17 times larger than the intrinsic Raman linewidth, this approach enhances the fringe contrast from 5.9(2)% to 15.1(2)%, indicating a substantial increase in effective atomic participation. Our results establish spectral-domain coherent control as a general strategy for achieving spectrally robust atom interferometry and open new opportunities for quantum sensing in systems with strong inhomogeneous broadening.

physics.atom-ph↗

arXiv2024

Closed-Loop Dual-Atom-Interferometer Inertial Sensor with Continuous Cold Atomic Beams

We demonstrate a closed-loop light-pulse atom interferometer inertial sensor that can realize continuous decoupled measurements of acceleration and rotation rate. The sensor operates with double-loop atom interferometers, which share the same Raman light pulses in a spatially separated Mach-Zehnder configuration and use continuous cold atomic beams propagating in opposite directions from two 2D$^+$ magneto-optical trappings. Acceleration and the rotation rate are decoupled and simultaneously measured by the sum and difference of dual atom-interferometer signals, respectively. The sensitivities of inertial measurements are also increased to be approximately 1.86 times higher than that of a single atom interferometer. The acceleration phase shift is compensated in real time by phase-locking these interferometers via the Raman laser phases from the sum interferometer signal, and the gyroscope perfomance is improved. We achieve long-term stabilities of $6.1 \ μg$ and 840 nrad/s for the acceleration and the rotation rate, respectively, using a short interrogation time of 0.87ms (interference area $A=0.097$ mm$^2$). This work provides a building block for an atomic interferometer based inertial measurement unit for use in field applications that require a high data-rate and high stability.

physics.atom-ph↗