2,864 research outputs found
Lattice Heat Capacity of Mesoscopic Nanostructures
We present a rigorous full quantum mechanical model for the lattice heat
capacity of mesoscopic nanostructures in various dimensions. Model can be
applied to arbitrary nanostructures with known vibrational spectrum in zero,
one, two, or three dimensions. The limiting case of infinitely sized
multi-dimensional materials are also found, which are in agreement with
well-known results. As examples, we obtain the heat capacity of fullerenes
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
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
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