Phys. Rev. Lett. 98, 227001 (2007) [4 pages]Narrow-Band Microwave Radiation from a Biased Single-Cooper-Pair TransistorReceived 19 September 2006; published 29 May 2007 We show that a single-Cooper-pair transistor (SCPT) electrometer emits narrow-band microwave radiation when biased in its subgap region. Photoexcitation of quasiparticle tunneling in a nearby SCPT is used to spectroscopically detect this radiation in a configuration that closely mimics a qubit-electrometer integrated circuit. We identify emission lines due to Josephson radiation and radiative transport processes in the electrometer and argue that a dissipative superconducting electrometer can severely disrupt the system it attempts to measure. URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.227001
DOI:
10.1103/PhysRevLett.98.227001
PACS:
85.25.Cp, 03.67.Lx, 74.50.+r, 85.60.Gz
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