qcodespp.instrument_drivers.multiplexer_instrument

Classes

Module Contents

class qcodespp.instrument_drivers.multiplexer_instrument.MultiplexerChannel(parent: Multiplexer, name: str, volt=0, curr=0)

Bases: qcodes.InstrumentChannel

Used to automatically add gates/channels in a Multiplexer to itself

class qcodespp.instrument_drivers.multiplexer_instrument.Multiplexer(name='MPX', volt_source_list=0, curr_list=0, open_volt=1, close_volt=-1, stepnum=101, **kwargs)

Bases: qcodes.Instrument

Treat an on-chip analog multiplexer as a qcodes instrument.

The driver assumes a multiplexer of the form in https://arxiv.org/abs/2304.12765. That is, it consists of a number of levels (lvls) each with two sets of transistors that can be either open/on or closed/off. Level 1 has two transistors, level 2 has four transistors, level 3 had eight and so on. The number of gates is twice the number of levels. Since the voltages to these gates needs to be applied by a ‘real’ instrument(s), you need to tell this instrument what those parameters are via volt_source_list. volt_source_list should be a list of the full parameter used to connect the multiplexer, e.g. [qdac.ch01.volt,qdac.ch02.volt,qdac.ch03.volt….] You can easily generate it by using e.g. [qdac.channel(i+1).volt for i in range(16)] If your instrument has current-measuring capability you can also pass these parameters via curr_list in a similar manner to volt_source_list. You can provide the open_volt, close_volt and stepnum (the number of steps each gate takes between the close_volt and open_volt) during initialisation, or later by addressing them as any other qcodes parameter. IMPORTANT! Note that this is for only ONE multiplexer! If you have e.g. a multiplexer and de-multiplexer on the source and drain side, respectively, you need two of these instruments.

lvls

gates

mpx_element(element, lvl)

print_all_voltages()

print_all_currents()

set_multiple_gates(voltage, gate_list=0, stepnum=101)

GrayCode()