尤物视频

Synopsis

Controlling the density and flux of particles inside of vacua plays a significant role in a wide range of industrial and scientific applications.  Examples include limiting the decoherence rate of ion and atom-based qbits, controlling systematic shifts in atomic clocks, and performing vacuum deposition methods for thin-film fabrication.  Single atoms constitute promising quantum sensors for a variety of applications including vacuum metrology. Key to their implementation is knowledge of the collision rate coefficients of the sensor atom with the various particles being detected.  These coefficients can be inferred from measurements of the sensor atom loss rate at various trap depths when exposed to a background gas of known density using an orifice flow pressure standard.  If the interaction potential between the sensor atom and the species of interest is known, the coefficient can be obtained from full quantum mechanical scattering calculations. A third method is to use the so-called collision universality law to estimate the coefficient from measurements of the sensor atom collision recoil energy distribution. In this talk, we will review the results obtained from these methods and discuss the latest developments in the field aimed to resolve the discrepancies observed.  With time permitting, I will discuss our latest efforts using entangled states to enhance the sensitivity of this quantum sensor.