Fig 1.
Ideal current to voltage characteristic of a Josephson junction under rf irradiation.
Quantized steps of order n = 0 and n = ±1 are clearly visible, along with their bias currents operating margins (blue shaded area).
Fig 2.
Schematics of a PJVS binary-divided array.
A single Josephson junction is represented by ×. Each subsection is individually biased on its n = 0 or n = ±1 quantum step by adjusting the current Ii,n.
Fig 3.
Circuital representation of the 13-bit PJVS system connected to fifteen independent AWG channels (Vin,i).
The blue shaded area shows the PJVS array and the rectangular boxes specify the number of junctions of each subsection. Ri is the output resistance of the ith AWG channel, which can be selected among 50 Ω, high impedance (open circuit) and low impedance (short circuit) in order to accomplish the desired operating mode.
Fig 4.
Flow chart of the Python software for the PJVS controlled operation.
Fig 5.
The graph displays the expected output waveform. On the right, the form for setting, saving and loading bias currents is shown.
Fig 6.
The graph displays the averaged current-voltage characteristics of fourteen Josephson junctions subdivided in three consecutive sub-arrays.
Fig 7.
The two graphs display the voltage measurement and its running standard deviation.