Cavity optomechanical device
We are interested in the physics and engineering of nanophotonic devices in the context of quantum information science, metrology, communications, and sensing. We use nanofabrication technology to develop engineered geometries that strongly enhance light-matter interactions, such as parametric nonlinear optical processes, coupling to quantum emitters, and acousto-optic effects. We study the basic device-level physics and tailor devices for specific applications, and our research generally involves computational modeling, nanofabrication, and optoelectronic and quantum photonic characterization. Recent topics have included quantum frequency conversion, single-photon and entangled-photon generation, microresonator frequency combs, optical parametric oscillators, and cavity electro-optomechanical transducers.
More generally, nanophotonic systems offer us the ability to study interesting physics in a controllable way, using platforms that are inherently suitable for the development of new technologies. Our labs are at the National Institute of Standards and Technology (NIST) in Gaithersburg, MD, and the Joint Quantum Institute at the University of Maryland in College Park.
Nanoscale electro-optomechanical transducers
Recent developments in the field of cavity optomechanics have resulted in devices for which GHz frequency phonons and 200 THz frequency optical photons are spatially co-located to the same length scale, often times in the context of structures that simultaneously take advantage of photonic and phononic bandgap concepts. Taken together with the strong photoelastic properties (i.e., the coupling of strain to refractive index) of materials like GaAs, this results in very large optomechanical coupling rates, so that even the phonon's zero-point motion can appreciably shift the frequency o
Integrated Quantum Photonics
Motivation:
Photonics is likely to play an important role in future quantum technologies for computing, communications, sensing, and metrology.
Research
Integrated Quantum Photonics
We are interested in the device-level development and system-level application of integrated photonics technologies for quantum communications, computing, sensing, and metrology. Devices under current development including single-photon and entangled-photon pair sources and quantum frequency converters.
Nonlinear Nanophotonics
Collaborators and Sponsors
Collaborators:
We are fortunate to work with many excellent researchers across the world. A partial list of recent collaborators is below; while only the Principal Investigator names are listed, they of course represent groups composed of outstanding students and postdocs that are the true engine behind all of the work.
Nonlinear Nanophotonics
Encoded Silicon Qubits: A High-Performance & Scalable Platform for Quantum Computing
For quantum computers to achieve their promise, regardless of the qubit technology, significant improvements to both performance and scale are required. Quantum-dot-based qubits in silicon have recently enjoyed dramatic advances in fabrication and control techniques. The “exchange-only” modality is of particular interest, as it avoids control elements that are difficult to scale such as microwave fields, photonics, or ferromagnetic gradients. In this control scheme, the entirety of quantum computation may be performed using only asynchronous, baseband voltage p
Kristiana Ramos
Research Areas:
Integrated photonics design/fab/test
Kartik Srinivasan
Kartik is a Fellow of the JQI and the NIST Microsystems and Nanotechnology Division. He received his undergraduate and graduate degrees in Applied Physics from Caltech and worked there as a postdoctoral scholar before moving to NIST in 2007. He joined the JQI in 2019.
Research Areas:
- Integrated photonics design/fab/test
- Integrated quantum photonics
- Nanoscale electro-optomechanical transducers
- Nonlinear nanophotonics