89 research outputs found
Electromechanics of Suspended Spiral Capacitors and Inductors
Most electromechanical devices are in two-dimensional metallic drums under
high tensile stress, which causes increased mechanical frequency and quality
factor. However, high mechanical frequencies lead to small zero-point
displacements , which limits the single-photon interaction rate
. For applications which demand large , any design with increased
is desirable. It is shown that a patterned drum by spiral shape
can resolve this difficulty, which is obtained by a reduction of mechanical
frequency while the motion mass is kept almost constant. An order of magnitude
increase in , and agreement between simulations and interferometric
measurements is observed
CUBIT: Capacitive qUantum BIT
In this letter, it is proposed that cryogenic quantum bits can operate based
on the nonlinearity due to the quantum capacitance of two-dimensional Dirac
materials, and in particular graphene. The anharmonicity of a typical
superconducting quantum bit is calculated, and the sensitivity of quantum bit
frequency and anharmonicity with respect to temperature are found. Reasonable
estimates reveal that a careful fabrication process can reveal expected
properties, putting the context of quantum computing hardware into new
perspectives.Comment: Published: 2 July 201
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