Synopsis: The chill factor of squeezed light

A laser beam in a squeezed state may be an effective source for cooling a macroscopic resonator.
Synopsis figure
Illustration: Alan Stonebraker

Cooling a macroscopic object to its mechanical ground state would enable many high-precision measurements that are currently limited by thermal noise, as well as open the possibility to observe a macroscopic quantum superposition of quantum states.

Analogous to the laser cooling of neutral atoms, radiation pressure can cool a mechanical resonator, such as a nanoscale beam. This has become an active area of research since the first experimental demonstrations in 2006, but so far, it has not been possible to cool a resonator completely to its ground state.

In a paper appearing in Physical Review A, Sumei Huang and Girish Agarwal of Oklahoma State University propose that using a “squeezed” beam of light instead of a classical field can enhance the effectiveness of cooling a resonator with radiation pressure. In a squeezed beam, one component of the radiation field has reduced noise at the expense of enhanced noise in the other component. Huang and Agarwal show that by coupling a parametric oscillator (a source of squeezed light) to a mechanical resonator, it should be possible to reduce the temperature of the resonator by a factor up to 20 compared with using a classical field.

If this method can be experimentally demonstrated and verified, it may lead to ground-state cooling of optomechanical resonators and have applications in high-precision metrology, such as gravitational wave detection. – Frank Narducci


More Announcements »

Subject Areas


Previous Synopsis

Next Synopsis


Superconductivity can be sensitive

Read More »

Related Articles

Viewpoint: Squeezed Light Reengineers Resonance Fluorescence
Atomic and Molecular Physics

Viewpoint: Squeezed Light Reengineers Resonance Fluorescence

By bathing a superconducting qubit in squeezed light, researchers have been able to confirm a decades-old prediction for the resulting phase-dependent spectrum of resonance fluorescence. Read More »

Synopsis: Polarons Drive a Magneto-Optical Effect

Synopsis: Polarons Drive a Magneto-Optical Effect

A surprisingly large magneto-optical response occurs when mobile electrons in a cooled material become trapped by their interaction with the surrounding lattice. Read More »

Synopsis: A Single-Photon Cheshire Cat
Quantum Physics

Synopsis: A Single-Photon Cheshire Cat

Researchers detected the polarization of a photon separate from the photon itself, just as the grin of Lewis Carroll’s Cheshire cat can appear apart from the cat’s body. Read More »

More Articles