Device and method for forming spin-dependent optical lattices

Abstract

The invention discloses a device and a method for forming spin-dependent optical lattices. The device is characterized by comprising atoms, a vacuum cavity, a lattice laser module, a phase adjustablecontrol module and a power adjustable control module, the method comprises the following steps: 1) arranging cold atoms of which the temperature can reach a micro-Kelvin order after laser cooling in avacuum cavity; 2) dividing the laser capable of forming the wavelength of the spin-dependent optical lattice into four beams, the first beam being linearly polarized laser, and inputting the linearlypolarized laser into a vacuum cavity; wherein the second beam and the third beam are respectively horizontal polarized light and vertical polarized light which are combined and then input into the vacuum cavity; the fourth beam is reference laser; and 3) collecting the light beams of the second beam and the third beam, adjusting the frequency and the phase, and adjusting the optical power at thesame time. The spin-dependent optical crystal lattice can be controlled, and then quantum control on the internal and external states of atoms is completed in the spin-dependent optical crystal lattice.

Description

technical field [0001] The invention relates to the field of laser technology and laser manipulation of cold atoms, in particular to a device and method for forming a spin-dependent optical lattice. Background technique [0002] Two-level atoms have two internal spin states, spin up and down. In the optical lattice trapping potential of special wavelengths, the atoms in the spin up state can only feel the right-handed circularly polarized light trapping potential. Atoms in the spin-down state strongly feel the trapping potential of left-handed circularly polarized light. Therefore, by precisely controlling the wavelength, polarization, phase, and power parameters of the optical lattice laser, a spin-dependent optical lattice can be formed to achieve precise control of the internal and external states of the atoms in the optical lattice. Since the trapping of atoms in different internal states in the spin-dependent optical lattice depends on the polarization of the lattice l...

AI Technical Summary

Problems solved by technology

However, the control accuracy of the polarization state by traditional methods is limited, the uncertainty of phase control is greater than 1 degree, and the control bandwidth is difficult to exceed 100kHz. At the same time, the control range of the phase is limited. For example, a single electro-optical modulator can only achieve a phase change of π.

Due to the limited manipulation of the polarization state by traditional methods, it is difficult to flexibly and widely manipulate spin-dependent optical lattices

Images