Changelog#

Starting from v2.2.0, the presto package follows Semantic Versioning as closely as possible. This changelog adopts the Keep a Changelog format.

Each version officially supports only versions of Python that are actively supported at the time of release. For example, presto v2.7.0 (released on 2023-01-18) supports Python 3.7 and above, but it does not support Python 3.6 and below.

Version 2.8.1 – 2023-02-14#

Changed#

  • Allow for a list of ports in Pulsed.output_dc_bias() to change DC bias during a pulsed sequence simultaneously on many ports.

Version 2.8.0 – 2023-02-03#

Added#

Changed#

  • Enable positive-only DC-bias ranges in Hardware.set_dc_bias() (range_i settings 0 and 1) for higher resolution on small positive voltages.

Version 2.7.1 – 2023-01-20#

Fixed#

  • Fixed Python 3.7 compatibility issue in pulsed module.

Version 2.7.0 – 2023-01-18#

Added#

Changed#

  • A DC bias set with Hardware.set_dc_bias() is now persistent across a firmware reload, e.g. when switching between pulsed and lockin mode, unless the hardware is initialized with force_reload=True.

Fixed#

  • Documentation for Lockin.set_phase_reset().

  • Fix bug causing spurious Pulsed.next_scale() events that could happen when the repetition period of an experiment was longer that half a millisecond.

  • Fix erroneous error message that would warn of an error when using template matching even though everything was good.

Version 2.6.0 – 2022-12-07#

Added#

  • Abort a pulsed measurement early if data corruption is detected.

Changed#

  • Improve handling of pulsed-mode commands at run time to enable longer two-qubit randomized benchmarking.

  • Update all internal libraries.

  • Speed up reconnecting to Presto if no settings are changed.

Removed#

  • Remove experimental feature enable_compression in Pulsed.run(): this feature is now covered by the improved handling of pulse-mode commands.

Fixed#

Version 2.5.1 – 2022-11-05#

Fixed#

Version 2.5.0 – 2022-09-20#

Added#

  • A pulsed measurement can now be triggered internally, by a SYSREF signal, or (new) by a signal on any of the digital inputs. See method Pulsed.run().

Changed#

  • Replace the sliding-window low-pass filter for Lockin introduced in 2.3.0 with a customizable 43-tap FIR filter. For the occasion, the new optional argument fir_coeffs replaces the previous nbox in methods Lockin.get_pixels() and SymmetricLockin.get_pixels().

Fixed#

  • Fixed an issue that could result in a DC bias not being set reliably on some units.

Version 2.4.1 – 2022-07-08#

Fixed#

Version 2.4.0 – 2022-06-23#

Added#

  • You can now choose whether a long drive is an envelope or a template. See new optional parameter envelope in Pulsed.setup_long_drive(). To maintain backwards compatibility, the default setting is envelope=True. Note that this is different from Pulsed.setup_template() where the default is envelope=False.

  • New interface to asynchronous measurements: Pulsed.run_async() returns a MeasurementHandle that allows interaction with a running measurement.

Changed#

  • Methods Lockin.get_pixels() and SymmetricLockin.get_pixels() now return the standard deviation as a complex number, where the real and imaginary parts encode the standard deviation of the real and imaginary parts of the demodulated signals. Taking the absolute value of the complex number results in the total standard deviation that was previously returned.

  • Many methods in Pulsed raise a RuntimeError exception if called after a measurement has already been run(). The previous behavior was not supported, see the warning in the documentation for the Pulsed class.

  • The output_port argument to Pulsed.setup_long_drive() now accepts a list to output the same pulse on multiple ports, much like Pulsed.setup_template() already did.

Fixed#

  • Fix inconsistencies in the documentation regarding maximum length of templates.

  • Improve error messages when running out of template slots.

Version 2.3.2 – 2022-06-06#

Fixed#

Version 2.3.1 – 2022-04-25#

Fixed#

  • Restore compatibility with Python 3.7+

Version 2.3.0 – 2022-04-21#

Added#

  • New class SymmetricLockin: a special-purpose version of Lockin with same frequencies on input and output (symmetric). The new class inherits from the previous one, so most of the Lockin functionality is available in SymmetricLockin as well.

  • New features for the lock-in: Presto can now low-pass filter the measured lock-in packets in real time with a sliding-window average, and also compute mean and standard deviation of the measured lock-in packets in real time over chunks with configurable width. Check out the summed, nbox and nsum optional parameters to Lockin.get_pixels().

  • The lock-in can output a trigger signal at the start of each integration window: Lockin.set_trigger_out().

  • utils.sin2() can now create DRAG-corrected pulses.

  • It is now possible to modify the DC bias output during a pulsed measurement sequence: Pulsed.output_dc_bias().

  • Print a warning if the signal on any of the input ports is out of range.

Changed#

  • Change the way errors from the hardware are reported to the user. It should help when the API is used through third-party software, such as Labber.

  • Improve handling of NCO frequencies when the same frequency is set on multiple ports. This can avoid long-term drift, see documentation for the tune parameter in Hardware.configure_mixer()

  • Increase length of command buffers: you can now send more pulses closer together! Useful for randomized benchmarking.

Fixed#

  • Fix bug in Lockin.get_pixels() where the data in first lock-in packet would often be corrupt.

  • The pulsed mode of operation is now more resilient to aborting measurements with Ctrl+C.

Version 2.2.1 – 2022-02-10#

Fixed#

Version 2.2.0 – 2022-02-09#

Added#

  • Method Hardware.set_dc_bias() now handles the DC bias outputs on Presto hardware.

  • Check that all programmed times in a pulsed sequence are nonnegative.

  • Method Pulsed.run() will now check for more inconsistencies and report errors:

    • if the programmed sequence contains overlapping calls to store(). Overlapping stores are not supported and could cause the experimental sequence to terminate abnormally, or not terminate at all.

    • if some select_frequency() or select_scale() event is trying to access indexes beyond what was programmed in the look-up tables with setup_freq_lut() and setup_scale_lut().

  • Method Pulsed.run() can now compress some pulse sequences so that they consume fewer commands. Compression is useful when there’s a long list of small templates output in quick repetition, such as in randomized benchmarking with thousands of Cliffords. To opt in to compression, pass enable_compression=True.

Changed#

  • Refactor calibration of ADC and DAC alignment. A calibration routine will be run when a new combination of Converter modes and Converter rates is requested. This will delay the start of a measurement by a few seconds, but only the first time a configuration is requested: the calibration will be stored on Vivace/Presto and will be available for all subsequent measurements without delay!

  • Method Pulsed.get_store_data() returns data in real form when adc_mode=AdcMode.Direct and in complex form when adc_mode=AdcMode.Mixed (when using digital downconversion).

  • Method Pulsed.setup_template_matching_pair() now accept complex-valued arguments when adc_mode=AdcMode.Mixed (when using digital downconversion).

  • Methods Pulsed.setup_long_drive() and Pulsed.setup_template() now accept complex-valued arguments when dac_mode=DacMode.Mixedxx (when using digital upconversion).

Fixed#

Version 2.1.0 – 2021-12-01#

  • Ability to choose frequency of external reference clock: see the optional argument ext_ref_clk to Pulsed and Lockin

  • Improvement to calibration routine during update.

pulsed module#

  • Fix a bug that caused the experiment to terminate too early or to never terminate when running long sequences with lots of averages.

  • A single sequence (without accounting for repetitions and averages) can now run for ≈6.5 days, up from ≈8.6 seconds.

Pulsed class#

  • Fix printing of estimated time left in a measurement when running from within some Python IDEs, e.g. Spyder.

  • Set tolerance for event times to 1% of get_clk_T(), rather than fixed at 1 ps.

  • Method run():

    • Better handling of startup time for a sequence: fixes an inconsistency with requirements on the period argument.

    • Raise an error if the user runs a sequence without setting up the scale look-up table on an output port and group used by some template, or if the frequency/phase look-up table was non set up when some templates are used as envelopes.

  • The parameter output_port to setup_template() can now be set to a list to more conveniently output the same pulse on multiple output ports.

  • Improve error messages when using not supported combinations of adc_mode, adc_fsample, dac_mode and dac_fsample

  • Fix error when running with dry_run set to True.

LongDrive class#

lockin module#

Lockin class#

  • Fix bug in tune_perfect()

  • Improve error messages when using not supported combinations of adc_mode, adc_fsample, dac_mode and dac_fsample

Version 2.0.0 – 2021-05-21#

This is the first major-version change since the previous Vivace API. This new API is compatible with both Vivace and Presto microwave platforms, and follows the same overall programming interface. There are, however, many differences that break backwards compatibility. See below for a summary of such changes.

hardware module#

New module to control configurations common to all modes of operation. Accessible as the hardware attribute of any instance of Pulsed and Lockin.

pulsed module#

Pulsed class#

  • The class constructor takes 4 new optional arguments: adc_mode, adc_fsample, dac_mode and dac_fsample. These configure the Converter modes and Converter rates for the input analog-to-digital (ADC) and output digital-to-analog (DAC) converters. With these options it is possible to enable digital up- and downconversion using the built-in digital IQ mixers.

  • The methods next_frequency(), next_scale(), select_frequency() and select_scale() take a new optional argument group. If not specified, both output groups on output_ports are affected.

  • The method run() (previously perform_measurement) does not return the result of store() events: use get_store_data() after running the experiment. To get the result of match() events, use get_template_matching_data() (same as before).

  • Method setup_freq_lut():

    • the old carrier argument (1 or 2) is replaced by the new group argument (0 or 1)

    • new argument phases_q must be specified when using the built-in digital IQ mixers for digital upconversion

    • the optional argument repeat_count is removed

  • Method setup_long_drive():

    • the old carrier argument (1 or 2) is replaced by the new group argument (0 or 1)

    • the optional argument use_scale is removed: all output templates are subject to the output scaler for the appropriate port and group

  • Method setup_scale_lut():

    • new mandatory argument group (0 or 1)

    • the optional argument repeat_count is removed

  • Method setup_template():

    • new mandatory argument group (0 or 1)

    • new argument template_q must be specified when using the built-in digital IQ mixers for digital upconversion

    • the optional argument use_scale is removed: all output templates are subject to the output scaler for the appropriate port and group

    • the optional argument envelope is now a boolean. To specify which signal generator to use when envelope=True, use the group argument (0 or 1)

  • New methods:

  • Deprecated methods:

    • perform_measurement: use run() instead

  • Some methods are moved to the new Hardware class, which is available as the hardware attribute to any instance of Pulsed:

LongDrive class#

Other#

utils module#

  • New function rotate_opt()

  • The function untwist_downconversion() now follows a different convention. The new convention is consistent with the built-in digital IQ mixers. It might or might not be consistent with the convention used by an external analog IQ mixer.

version module#

  • New attributes:

    • version_api: the only one of interest to the user. It is also exported as the __version__ attribute to the presto module

    • version_conductor

    • version_fpga

    • version_rpu

  • Removed functions:

    • get_variant_firmware

    • get_version_all

    • get_version_api

    • get_version_clock

    • get_version_firmware

    • get_version_server