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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 quantum science, technology and optics play a defining role. Systems under study include ultracold atoms and molecules, quantum dots, optical microcavities, the quantum optics of nanosystems, metallic nanoparticles, nanomechanical systems, dopant-based and nanofabricated Si devices for charge sensing and quantum operation, and novel spintronics devices. Such systems arise in atomic clocks, quantum science and technology, nanosensing, and nanomaterials.

Our research combines theory and experiment. Theory is extending the fundamental understanding of systems at the atomic/nanoscale interface, probing the frontier between the classical and the quantum to interpret experiment, exploring new applications in nanoscale and quantum technologies, and motivating new and enhanced precision metrology. For example, we are developing the theoretical understanding needed to create nanoplasmonic and quantum dot structures for emerging quantum and nanoscale technologies, to develop next generation atomic clocks, to simulate exotic condensed matter with ultracold atoms, to understand quantum information propagation in interacting systems, 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. We are developing quantum dots as reliable sources of single photons, charge 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. We are investigating novel materials for spintronics. We are exploiting nanoscale Si devices to provide precision charge sensing on-chip. We are exploring the use of these nanoscale Si devices for quantum technology and are pushing these devices to the atomic scale by exploiting structures fabricated by controlled placement of individual dopants. Such devices will allow us to explore the ultimate atomic-scale limit for traditional Si electronic devices and implement atomic-scale quantum technologies in Si. To enable these efforts, we are developing the isotopically enriched Si required for Si quantum technology.


Reactivity and chaos in collisions of Atoms and Molecules—Collisions and reactions between atoms and molecules are fundamental to many parts of physics and chemistry. They control, for example, the rate at which gasses approach thermodynamic equilibrium …

Quantum Many-Body Physics, Quantum Optics, and Quantum Information—The main long-term goals of our theoretical research group are to understand and control large interacting quantum systems, as well as to design and create new ones. To achieve these goals, we …

Designing the Nanoworld: Nanostructures, Nanodevices, and Nanooptics—Nano and atomic scale theory of the electronic, optical and mechanical properties of ultrasmall structures, such as semiconductor quantum dots and dopants in Si, the operation of devices made from …

Fabry-Perot Displacement Interferometry—High-resolution Fabry-Perot interferometry is being developed and employed for demanding applications in mechanical displacement metrology.

Micro- and nano-optomechanical systems—Light can interact with mechanical systems in interesting and useful ways, not only probing the mechanical motion with spectacular sensitivity, but also driving the mechanics via radiation pressure …

Si-Based Single Spin Coherence and Manipulation—We are characterizing Si-based single-electron quantum dots at low temperatures (down to 10 mK) to explore the possibility of quantum coherent manipulation in Si-based technology.

Silicon-based single electron current standards —We are working to fabricate and perform low-temperature measurements of CMOS-compatible single electron devices in silicon which could be used as a standard of electrical current. Our goal is to …

Fabrication and Metrology of Novel Magnetic Tunnel Junctions in the Ultra-thin Barrier Limit—Magnetic tunnel junctions, nanostructured by highly charged ions, are being probed and characterized to establish the foundation for novel magnetic random access memory architectures expected to …

Quantum State Manipulation of Ultra-cold Fermionic and Bosonic Atoms—This theoretical research is done in collaboration with scientists at the Joint Quantum Institute (JQI) and the Center for Quantum Information and Computer Science (QuICS), both research …

Light-matter Interactions in Semiconductor Nanostructures—The quantum optics of light interacting with semiconductor-based nanostructures is being studied to extend concepts of entanglement and coherence in atomic physics to solid-state systems such as …


For Technical Inquiries:

Garnett Bryant, Group Leader
100 Bureau Drive, M/S 8423
Gaithersburg, MD 20899-8423

301-975-2595 Telephone
301-975-5485 Facsimile

301-975-3206 Secretary Telephone