From: Negative-resistance models for parametrically flux-pumped superconducting quantum interference devices
(Angular) frequency
Designation
Relation
ω 1
“signal”
ω 2
“idler” (three-wave difference)
ω 3 − ω 1
ω 3
“pump”
ω 4
“idler” (three-wave sum)
ω 3 + ω 1
ω 5
“idler” (four-wave difference)
2 ω 3 − ω 1
ω 6
“idler” (four-wave sum)
2 ω 3 + ω 1