Physics – Condensed Matter – Superconductivity
Scientific paper
2009-05-11
Appl. Phys. Lett. 95, 042505 (2009)
Physics
Condensed Matter
Superconductivity
Corrected and completed references 6,7,8. Updated some minor details in figures
Scientific paper
10.1063/1.3186047
We fabricated and tested a squelch circuit consisting of a copper powder filter with an embedded Josephson junction connected to ground. For small signals (squelch-ON), the small junction inductance attenuates strongly from DC to at least 1 GHz, while for higher frequencies dissipation in the copper powder increases the attenuation exponentially with frequency. For large signals (squelch-OFF) the circuit behaves as a regular metal powder filter. The measured ON/OFF ratio is larger than 50dB up to 50 MHz. This squelch can be applied in low temperature measurement and control circuitry for quantum nanostructures such as superconducting qubits and quantum dots.
den Braver W. A.
Forn-Díaz Pol
Harmans J. P. C. M.
Mooij J. E.
Schouten R. N.
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