Precision measurement and compensation of optical Stark shifts for an ion-trap quantum processor

Elliptical polarization for molecular Stark shift compensation in deep optical traps

In optical dipole traps, the excited rotational states of a molecule may experience a very different light shift than the ground state. For particles with two polarizability components (parallel and perpendicular), such as linear $^1Σ$ molecules, the differential shift can be nulled by choice of elliptical polarization. When one component of the polarization vector is $\pm i\sqrt{2}$ times the orthogonal component, the light shift for a sublevel of excited rotational states approaches that of the ground state at high optical intensity. In this case, fluctuating trap intensity need not limit co…

利用功率调制主动补偿双光子 rubidium 光频标准中的 AC 斯特克移位

Active compensation of the AC Stark shift in a two-photon rubidium optical frequency reference using power modulation

本文提出反馈协议以抑制双光子 rubidium 光频标准中的 AC 斯特克移位，将对光学功率变化的敏感性降低1000倍，从而在保持短期和长期稳定性的同时实现1秒和10^4秒的稳定性分别为3×10^-14和2×10^-14。

Compensation of the trap-induced quadrupole interaction in trapped Rydberg ions

The quadrupole interaction between the Rydberg electronic states of a Rydberg ion and the radio frequency electric field of the ion trap is analyzed. Such a coupling is negligible for the lowest energy levels of a trapped ion but it is important for a trapped Rydberg ion due to its large electric dipole moment. This coupling cannot be neglected by the standard rotating-wave approximation because it is comparable to the frequency of the trapping electric field. We investigate the effect of the quadrupole coupling by performing a suitable effective representation of the Hamiltonian. For a single…

Compensation of Field-Induced Frequency Shifts in Ramsey Spectroscopy of Optical Clock Transitions

We have extended Ramsey spectroscopy by stepping the probe frequency during the two Ramsey excitation pulses to compensate frequency shifts induced by the excitation itself. This makes precision Ramsey spectroscopy applicable even for transitions that have Stark and Zeeman shifts comparable to the spectroscopic resolution. The method enables a new way to evaluate and compensate key frequency shifts, which benefits in particular, optical clocks based on magnetic field-induced, spectroscopy, two-photon transitions, or heavily forbidden transitions.

冷里德伯原子的杂散电场光电离补偿

Photo-ionization Compensation of Stray Electric Fields for Cold Rydberg Atoms

本研究针对中性原子量子平台中杂散电场的新来源，采用冷原子系综光电离补偿法，结合外部电极消除残余电场，为提升相关量子技术性能提供了实用方案。

Modified hyper-Ramsey methods for the elimination of probe shifts in optical clocks

We develop a method of modified hyper-Ramsey spectroscopy in optical clocks, achieving complete immunity to the frequency shifts induced by the probing fields themselves. Using particular pulse sequences with tailored phases, frequencies, and durations, we can derive an error signal centered exactly at the unperturbed atomic resonance with a steep discriminant which is robust against variations in the probe shift. We experimentally investigate the scheme using the magnetically-induced $^1$S$_0- ^3$P$_0$ transition in $^{88}$Sr, demonstrating automatic suppression of a sizeable \num{2e-13} prob…