Probing material properties at surfaces down to the single-particle scale of atoms and
molecules has been achieved, but high-resolution subsurface imaging remains a …

Large-scale quantum effects have always played an important role in the foundations of
quantum theory. With recent experimental progress and the aspiration for quantum …

An ensemble of atoms can operate as a quantum sensor by placing atoms in a
superposition of two different states. Upon measurement of the sensor, each atom is …

A pair of conjugate observables, such as the quadrature amplitudes of harmonic motion,
have fundamental fluctuations that are bound by the Heisenberg uncertainty relation …

The measurement sensitivity of quantum probes using N uncorrelated particles is restricted
by the standard quantum limit, which is proportional to 1/N. This limit, however, can be …

Quantum mechanics dictates that a continuous measurement of the position of an object
imposes a random quantum back-action (QBA) perturbation on its momentum. This …

We report on the development of a microfabricated atomic magnetic gradiometer based on
optical spectroscopy of alkali atoms in the vapor phase. The gradiometer, which operates in …

We theoretically show that strong mechanical quantum squeezing in a linear
optomechanical system can be rapidly generated through the dynamical instability reached …

The interaction between an atomic ensemble and a light mode in a high-finesse optical
cavity can easily reach the strong-coupling regime, where quantum effects dominate. In this …

The standard quantum limit constrains the precision of an oscillator position measurement. It
arises from a balance between the imprecision and the quantum backaction of the …