Quantum Processes and Metrology Group

The Quantum Processes and Metrology Group focuses on developing and exploiting precision metrology at the interface between atomic and nanoscale systems where optics, quantum optics and quantum information play a defining role. Systems under study include ultracold atoms and molecules, quantum dots and wires, optical microcavities, the quantum optics of nanosystems, metallic nanoparticles, nanomechanical systems, and systems with nanoscale features induced on surfaces by highly charged ions. Such systems arise in atomic clocks, quantum information, quantum devices, nanolasers, detectors, biomarkers and sensors, nanomaterials, and advanced lithography.

Our research combines theory and experiment. Theory is used to extend the fundamental understanding of systems at the atomic/nanoscale interface, probing the frontier between the classical and the quantum to interpret experiment, to explore new applications in nanoscale and quantum technologies, and to motivate new and enhanced precision metrology. For example, we are developing the theoretical understanding needed to create nanooptics  and quantum dot structures that will be needed in emerging quantum and nanoscale technologies, to develop next generation atomic clocks, to simulate condensed matter with cold atoms and to implement useful quantum information, detection and measurement protocols. 

Experiment programs are being conducted to develop new precision measurement tools for this regime, to collect precise data essential for the applications mentioned, and to further the understanding of these systems. We are probing the charge and spin transport, optical, and mechanical properties of nanoscale and quantum-coherent systems. We are developing and exploiting the metrology needed to make accurate optical and transport measurements of individual quantum nanosystems and subatomic dimensions.  We are developing quantum dots as reliable sources of single photons, charge qubits and spin qubits, and are developing the tools to entangle the photons and qubits from such dots.   We are creating nanomechanical devices whose mechanical vibration can approach the quantum ground state, opening the way to applying the concepts of non-classicality to macroscopic physical systems. Ultrahigh precision measurements of the linear and nonlinear optical response of fluids and lens materials needed for next generation optical lithography are being developed and carried out. Such measurements are critically needed by the semiconductor industry to develop immersion lithography for sub-100 nm optical nanolithography.