Dr. Kevin D. Osborn

Laboratory for Physical Sciences

8050 Greenmead Dr.

College Park, MD  20740

Lab Phone: 301-935-6415

Reception: 301-935-6400

Facsimile: 301-935-6723


KDO Research Group

Superconducting Quantum Computing and Low Temperature Physics

By cooling circuits 10,000 times closer to absolute zero than room temperature entire circuits enter quantum mechanical states, where quantized energy levels dictate their dynamics, and anharmonic oscillator circuits behave like  artificial atoms which can be used as quantum bits (qubits). While atomic wavefunctions describe the position of electrons near a nucleus, those of superconducting circuits are used to described the superposition state of circuit quantities, such as current or voltage. Particularly, in this group we have studied tunneling atoms from insulating regions of these circuits, which are known to limit the performance through decoherence. Following quantum device studies, new circuits are developed either to ameliorate this challenge or exploit new phenomena that may be advantageous.

A qubit defect is individually probed in a thick film for the first time, and the circuits (one example above) use cavity quantum electrodynamics (CQED). The use of CQED with superconducting qubits was pioneered by researchers at Yale U., and here we extend it to tunneling two-level systems in capacitors.