SHFQA#

The Zurich Instruments SHFQA is our second generation quantum analyzer, designed to readout superconducting and spin qubits. It integrates frequency upconversion to 8.5 GHz, and up to 4 readout channels that can faithfully discriminate up to 16 qubits, 8 qutrits or 5 ququads.

Please refer to the user manual for an in-depth explanation of all features.

Like every device the device specific settings and data is organized in a path like structure called the node tree. zhinst-toolkit provides a pythonic way of interacting with this node tree. For more information about all functionalities and usage of the node tree in toolkit refer to the dedicated section.

The package zhinst-utils provided by Zurich Instruments offers a collection of helper functions to ease the use of the SHFQA among other devices. Toolkit embeds these functions inside the nodetree. The following table shows the equivalent functions in zhinst-toolkit.

zhinst-utils	zhinst-toolkit	info
start_continuous_sw_trigger()	`shfqa.start_continuous_sw_trigger()`	Issues a specified number of software triggers.
max_qubits_per_channel()	`shfqa.max_qubits_per_channel()`	Maximum number of supported qubits per channel.
qachannel	shfqa.qachannels[n]…
configure_channel()	`...configure_channel()`	Configures the RF input and output of a specified channel.
generator	shfqa.qachannels[n].generator…
enable_sequencer()	`...enable_sequencer()`	Starts the sequencer of a specific channel.
	`...wait_done()`	Wait until the generator execution is finished.
load_sequencer_program()	`...load_sequencer_program()`	Compiles and loads a program to a specified sequencer.
write_to_waveform_memory()	`...write_to_waveform_memory()`	Writes pulses to the waveform memory.
	`...read_from_waveform_memory()`	Read pulses from the waveform memory.
configure_sequencer_triggering()	`...configure_sequencer_triggering()`	Configure the triggering of a specified sequencer.
readout	shfqa.qachannels[n].readout…
configure_result_logger_for_readout()	`...configure_result_logger()`	Configures the result logger for readout mode.
enable_result_logger(mode=”readout”)	`...run()`	Reset and enable the result logger.
	`...stop()`	Stop the result logger.
	`...wait_done()`	Wait until readout is finished.
get_result_logger_data(mode=”readout”)	`...read()`	Waits until the logger finished recording and returns the measured data.
configure_weighted_integration()	`...write_integration_weights()`	Configures the weighted integration.
	`...read_integration_weights()`	Read integration weights from the waveform memory.
spectroscopy	shfqa.qachannels[n].spectroscopy…
configure_result_logger_for_spectroscopy()	`...configure_result_logger()`	Configures the result logger for spectroscopy mode.
enable_result_logger(mode=”spectroscopy”)	`...run()`	Reset and enable the result logger.
	`...stop()`	Stop the result logger.
	`...wait_done()`	Wait until spectroscopy is finished.
get_result_logger_data(mode=”spectroscopy”)	`...read()`	Waits until the logger finished recording and returns the measured data.
scope	shfqa.scopes[0]…
configure_scope()	`...configure()`	Configures the scope for a measurement.
	`...run()`	Run the scope recording.
	`...stop()`	Stop the scope recording.
	`...wait_done()`	Wait until the Scope recording is finished.
get_scope_data()	`...read()`	Read out the recorded data from the scope.

The following examples give a brief overview of how the SHFQA can be used in zhinst-toolkit.