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Ultra-sensitive Detectors and Broadband Quantum-limited Amplifiers Based on Nitride Superconductors

Event Details

Event Dates: 

Thursday, October 10, 2013 - 12:00pm

Seminar Location: 

  • Duane Physics Room D142

Speaker Name(s): 

Jiansong Gao

Speaker Affiliation(s): 

NIST Boulder
Seminar Type/Subject

Scientific Seminar Type: 

  • Condensed Matter Seminar

Event Details & Abstract: 

Superconducting nitrides, such as TiN and NbTiN, show many ideal properties for microwave kinetic inductance detectors (MKIDs) such as extremely low loss, large kinetic inductance, and tunable Tc. In addition, its unique nonlinearity with very low dissipation can be used to build a novel broadband quantum-limited microwave parametric amplifier called kinetic inductance amplifier (KIT), which has important applications in readout of superconducting detectors and quantum bits (qubits). In this talk, I will present our recent progress in the development of TiN/NbTiN-based detectors and amplifiers. These detectors are approaching photon noise limit and the KIT amplifiers have achieved over 4 GHz of bandwidth with gain exceeding 20dB.