Mary Beth Rothwell

Superconducting qubit in a waveguide cavity with a coherence time approaching 0.1 ms

We report a superconducting artificial atom with a coherence time of

A Practical Implementation of Silicon Microchannel Coolers for High Power Chips

{T}_{2}^{*}=92

Improved superconducting qubit coherence using titanium nitride

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Protecting superconducting qubits from radiation

s and energy relaxation time

A 10.5-in.-diagonal SXGA active-matrix display

{T}_{1}=70

Looking into the crystal ball: future device learning using hybrid e-beam and optical lithography (Keynote Paper)

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Resist contrast enhancement in high resolution electron beam lithography

s. The system consists of a single Josephson junction transmon qubit on a sapphire substrate embedded in an otherwise empty copper waveguide cavity whose lowest eigenmode is dispersively coupled to the qubit transition. We attribute the factor of four increase in the coherence quality factor relative to previous reports to device modifications aimed at reducing qubit dephasing from residual cavity photons. This simple device holds promise as a robust and easily produced artificial quantum system whose intrinsic coherence properties are sufficient to allow tests of quantum error correction.

Quantum information storage using tunable flux qubits

This paper describes a practical implementation of a single-phase Si microchannel cooler designed for cooling very high power chips such as microprocessors. Through the use of multiple heat exchanger zones and optimized cooler fin designs, a unit thermal resistance 10.5 C-mm2 /W from the cooler surface to the inlet water was demonstrated with a fluid pressure drop of <35kPa. Further, cooling of a thermal test chip with a microchannel cooler bonded to it packaged in a single chip module was also demonstrated for a chip power density greater than 300W/cm2. Coolers of this design should be able to cool chips with average power densities of 400W/cm2 or more