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Abstracts
P4.10
Magneto-electric and Dielectric Effect Measurement Technique at
very Low Temperatures
J.S. Xia(1), L. Yin(1), N.S. Sullivan(1), V.S. Zapf(2), and A. Paduan-Filho(3)
1) sNational High Magnetic Field Laboratory, and University of Florida,
Gainesville, FL 32611, USA
2) National High Magnetic Field Laboratory, Los Alamos National Laboratory,
Los Alamos, NM 87545, USA
3) Instituo de Fisica, University de Sao Paulo, Sao Paulo, 05315-970 SP, Brazil
We report the design and operation of a device for studying the magneto-electric,
dielectric effect, and resistance at very low temperatures (below 10 mK). The
unique advantage is the sample is directly immersed in cold liquid
3
He, which is
cooled with a large (25 M2) surface area silver sinter heat exchange connected
to a nuclear stage magnetization refrigerator. An AC coil is added outside of
the sample, so that the capacitance, resistance and DC and AC effects can be
measured simultaneously. The details and performance of the device are discussed,
and a few of the measurements are demonstrated.
P4.11
Microwave source based on SINIS Junction
Masuda Shumpei, Tan Kuan Yen, Partanen Matti, Lake Russell, Govenius Joonas,
M¨ott¨onen Mikko
Aalto
University,
department
of
Applied
Physics,
QCD Labs, PO Box 13500, FI-00076 Aalto, Finland
Superconducting circuits provide a promising platform for quantum technological
applications. In this context, microwave photons in superconducting resonators
and waveguides are routinely used as information and energy carriers between
different components of the circuit. We demonstrate an engineered microwave
photon source driven by voltage-controlled quantum tunneling of electrons
through superconductor-insulator-normal metal junctions. We observe the direct
conversion of the electronic energy into microwave photons by measuring the
energy spectrum of the created microwave radiation. This device enables electrical
control of the photonic state as well as the output power emitted from the
resonator, thus functioning as an on-demand photon source that can readily be
integrated into quantum circuits.
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