Parametric Amplification and Noise Squeezing in Room Temperature Atomic Vapors.

  title={Parametric Amplification and Noise Squeezing in Room Temperature Atomic Vapors.},
  author={Vera Guarrera and R. Gartman and Giuseppe Bevilacqua and Giovanni Barontini and Witold Chalupczak},
  journal={Physical review letters},
  volume={123 3},
We report on the use of parametric excitation to coherently manipulate the collective spin state of an atomic vapor at room temperature. Signatures of the parametric excitation are detected in the ground-state spin evolution. These include the excitation spectrum of the atomic coherences, which contains resonances at frequencies characteristic of the parametric process. The amplitudes of the signal quadratures show amplification and attenuation, and their noise distribution is characterized by… 
2 Citations

Figures from this paper

Optimal Estimation of Conjugate Shifts in Position and Momentum by Classically Correlated Probes and Measurements

Multi-parameter estimation is necessary for force sensing due to simultaneous and nontrivial small changes of position and momentum. Designing quantum probes that allow simultaneous estimation of all

Spin dynamic response to a time dependent field

The dynamic response of a parametric system constituted by a spin precessing in a time dependent magnetic field is studied by means of a perturbative approach that unveils unexpected features, and is



Squeezing a thermal mechanical oscillator by stabilized parametric effect on the optical spring.

An experimental scheme based on parametric feedback control of the oscillator, which stabilizes the amplified quadrature while leaving the orthogonal one unaffected, allows the technique to surpass the -3  dB limit in the noise reduction, associated with parametric resonance.

Parametric excitation and squeezing in a many-body spinor condensate

A many-body control scheme to coherently excite and control the quantum spin states of an atomic Bose gas that realizes parametric excitation of many- body collective spin states by time varying the relative strength of the Zeeman and spin-dependent collisional interaction energies at multiples of the natural frequency of the system is demonstrated.

Observation of squeezed states generated by four-wave mixing in an optical cavity.

Squeezed states of the electromagnetic field have been generated by nondegenerate four-wave mixing due to Na atoms in an optical cavity by measuring the total noise level in the deamplified quadrature below the vacuum noise level.

Linear and nonlinear coherent coupling in a Bell-Bloom magnetometer

Spin-exchange collisions in hot vapours are generally regarded as a decoherence mechanism. In contrast, we show that linear and non-linear spin-exchange coupling can lead to the generation of atomic

Atomic magnetic resonance induced by amplitude-, frequency-, or polarization-modulated light

In recent years diode laser sources have become widespread and reliable tools in magneto-optical spectroscopy. In particular, laser-driven atomic magnetometers have found a wide range of practical

Mechanical squeezing via parametric amplification and weak measurement.

Compared to backaction evasion, it is demonstrated that the measurement strength, temperature and efficiency requirements for quantum squeezing are significantly relaxed.

Generation of a squeezed state of an oscillator by stroboscopic back-action-evading measurement

Squeezed states make it possible to circumvent the standard quantum limit. Using stroboscopic measurements one can create squeezed states of a rather unusual oscillator: the collective spin of an

Classical amplitude squeezing for precision measurements.

These techniques can reduce the uncertainty in measurements of the frequency of an oscillator; for example, the thermal uncertainty in the relativistic frequency shift in single ion mass spectroscopy can be reduced by more than a factor of 5.

Spin-exchange narrowing of the atomic ground-state resonances

We have measured the magnetic-resonance linewidth of Zeeman coherences in a caesium vapour as a function of magnetic field from zero to 200 µT. In the regime where the spin-exchange rate is larger

Room temperature femtotesla radio-frequency atomic magnetometer.

A radio-frequency tunable atomic magnetometer with a sensitivity of about 1 fT/Hz1/2 in a range of 10–500 kHz is demonstrated. The magnetometer is operated in the orientation configuration in which