Low noise microwave parametric amplifier

Parametric amplification in Josephson junction embedded transmission lines

“…Recent progress in the development of near quantumnoise-limited microwave amplifiers has enabled ultrasensitive detection in radio astronomy 1 and real-time monitoring of quantum bits. 2,3 Superconducting parametric amplifiers, [4][5][6][7][8] in particular, have demonstrated reliable, low-noise operation with power gain in excess of 20 dB and bandwidth ranging from 1-10 MHz. [9][10][11][12][13] These amplifiers, however, comprise a single Josephson junction or an array of junctions in a resonant cavity which ultimately limits the bandwidth and dynamic range.…”

A low-noise series-array Josephson junction parametric amplifier

“…Early Josephson parametric amplifiers have tended to be very noisy, as discussed in the review by Feldman et al 2 More recently, considerable success in obtaining low noise performance from Josephson parametric amplifiers [3][4][5][6][7] has been achieved. In fact, Josephson parametric amplifers with double sideband noise performance exceeding the quantum limit for linear phase-insensitive amplifiers 8 have been used to generate squeezed states of the electromagnetic field at 20 GHz.…”

Superconducting components for infrared and millimeter-wave receivers

“…Josephson parametric amplifiers can be operated with an external pump, or by using the ac Josephson currents as an internal pump. Because of the narrower pump linewidth, the externally pumped amplifiers achieve better performance [48,49]. When a junction is pumped at wp and biased with I=V=O, the result is a four-photon parametric amplifier with Ws+wr=2 wp.…”