Quantum Physics & Devices

Persistent current from Jack Harris

Current Projects

Search for new Interactions in a Microsphere Precision Levitation Experiment (SIMPLE)

Links:  Moore Lab website, David Moore

input opticsSIMPLE is a setup at Wright Lab to optically levitate micron sized spheres (“microspheres”) in a laser beam in vacuum.  In high vacuum, the microspheres can be isolated from their room temperature surroundings and their position can be controlled and measured optically using the transmitted laser light.  These techniques allow extremely tiny forces acting on the sphere to be precisely detected, enabling the search for physics beyond the Standard Model and increasing understanding of some of the major unanswered questions in high energy physics.

Optomechanics

Links:  Harris Lab website, Jack Harris

optomechanics renderingThe Harris group studies the mechanical properties of light, particularly the quantum aspects of optical forces exerted on micromechanical mirrors. These unusual forces offer powerful new means for manipulating both microstructures and light.

Radiation pressure in the quantum engine

The group is developing techniques to measure quantum aspects of the radiation pressure in optical cavities. This involves integrating ultrahigh sensitive mechanical detectors into high finesse optical cavities.

Optical control of microstructures

The group uses radiation pressure to manipulate micromechanical structures on unprecedentedly fine length scales , to laser cool them, and to study the nonlinear dynamics of coupled optical and mechanical systems.

Mechanical control of nonclassical light

The quantum fluctuations of light can be altered by the response of a sufficiently flexible mirror. The group is exploring the possibility of using this effect to generate squeezed and entangled light.

Persistent Current

Links:  Harris Lab websiteJack Harris

persistent current zoomsThe Harris lab uses ultrasensitive micromechanical detectors to study mesoscopic electronic systems. This work focuses on normal-metal persistent currents, a quantum phenomenon in which electrical current flows through a resistor in the absence of a voltage.

Microcantilevers as probes of closed mesoscopic systems

Fabricating a sub-micron circuit on the end of a cantilever allows us to study it in isolation.

In-situ electron thermometry

Monitoring the devices superconducting transition makes it possible to determine the temperature of the isolated metal ring.

Persistent currents in normal-metal rings

A number of important questions remain unanswered about the properties of dissipationless currents flowing through resistors.