ISSTT Proceedings

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Quantum-limited Mixing in a Transformer-coupled SIS Resonator for the 600 GHz Frequency Band

Authors:
Cheuk-yu Edward Tong, Raymond Blundell, Krikor G Megerian, Jeffrey A. Stern, Henry G LeDuc
Abstract:
Quantum-limited mixer noise temperature has been achieved in Superconductor-Insulator-Superconductor (SIS) resonant mixer in the 600 — 720 GHz frequency range. Our mixer employs a single full-wave Nb/A1N/Nb tunnel junction resonator, fed by a quarter-wave transformer. The devices have low critical current density (~5 kA/cm²). The mixers were tested in a fixed-tuned waveguide mixer mount. Double-side-band receiver noise temperatures equivalent to a few quanta have been measured for a number of different devices. Using a 0.55 × 25 µm resonator, a noise temperature of 141 K was recorded at an LO frequency of 700 GHz with the mixer at 4.2 K. The noise temperature dropped to 111 K when the helium bath was pumped down to 2.8 K. High sensitivity has attained over reasonably wide RF bandwidth, ~17%. The IF bandwidth of these mixers has also been investigated.
Categories:
SIS
Year:
2002
Session:
1
Full-text:
Download a PDF of this paper.
Page Number(s):
23-32