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Release Notes

Release 2.55.0

Release date 03.07.2025

Requires: LabOne 25.04

Includes: Applications Library 2.9.0

Notes & Important Changes

Functionality

  • The auto-chunking system now intelligently handles program memory constraints by automatically detecting when compiled programs exceed instruction memory limits.
  • Added a __getitem__ method to QPU as a way to efficiently return quantum elements by UID, slice, or type. You can now retrieve elements using intuitive bracket notation: by UID (qpu["q0"]), multiple UIDs (qpu[["q0", "q1"]]), slice indexing (qpu[:2]), or by type (qpu[Transmon]). The quantum_element_by_uid method has been deprecated in favor of this more flexible and user-friendly interface.
  • Generalized the caching mechanism in the serialization system to support multiple object types beyond just pulses. The new ObjectCache framework now provides caching for both Pulse objects and Section objects, reducing serialized data size and improving performance by avoiding duplication of repeated objects.
  • A new copy() method has been added to the QuantumOperations class, enabling users to create independent copies of quantum operations instances. The copied instance includes all registered operations but intentionally excludes the attached QPU, allowing the copy to be attached to a different QPU as needed. This enhancement provides greater flexibility when working with quantum operations across multiple quantum processing units.
  • The add_quantum_elements method has been added to the dsl namespace, which can manually add logical signals and calibration of quantum elements to an Experiment. Learn how to use it in our tutorial!
  • Added the QPUTopology class, which stores the topology information of the QPU as a multi-edged directed graph. The topology is an attribute of the QPU and may be accessed via qpu.topology. This feature facilitates operations involving multiple quantum elements, such as multi-qubit gates. Check out our new tutorial describing how to use this feature.

Note

LabOne Q has ended support and testing for Python version 3.9 with version 2.53. Please make sure to upgrade your Python environments to a supported version before upgrading.

Note

Including the instrument options when constructing the DeviceSetup is now a strict requirement since version 2.52.0. Specify your instrument configuration through either the 'options' field in the 'instruments' list when using a device setup descriptor, or by specifying the device_options argument when constructing your setup programmatically. Alternatively, you can use the generate_device_setup helper function available under contrib, which has the option to query the instruments for installed options automatically. This function is already used in the majority of our publicly available examples.

Applications Library

  • All references to qpu.qubits in the documentation have been updated to qpu.quantum_elements. The attribute qpu.qubits was deprecated in LabOne Q 2.52.0.
  • Implemented the temporary_qpu and temporary_quantum_elements_from_qpu tasks for experiments and experiment workflows. This enables the temporary modification of parameters in the QPU topology in the future. All experiments in the Applications Library have been updated to use temporary_qpu and temporary_quantum_elements_from_qpu instead of temporary_modify. The temporary_modify task has been deprecated.

Deprecation notice

Note

The deprecated Results.compiled_experiment attribute has been removed.

Note

The Qubit and Transmon classes are not yet considered stable and their APIs might still change in future versions. Their parent QuantumElement class has been updated with version 2.44, making it much simpler to create your own implementation of a qubit object.

Note

The temporary_modify task from the Applications library has been deprecated. Please use temporary_qpu and, if needed, temporary_quantum_elements_from_qpu instead.

Bug Fixes

  • Fixed serialization bug by correcting parameter type definitions to support both single parameters and parameter lists in sweep operations and pulse parameters in LabOne Q DSL.
  • Fixed a bug in pipeliner emulation for SHFQC instrument causing controller timeouts and missing measurement results.
  • Fixed a bug where trigger outputs were not being generated when a trigger signal was configured on a section but no pulses were played on that signal within the section.

Documentation

  • Updated the "Writing an Experiment Workflow" tutorial with a section explaining how to manually add additional quantum elements to an experiment using dsl.add_quantum_elements.
  • Updated the serialization tutorial to include benchmarks. The new serializer is in many cases ~2x faster than LabOne Q's old serializer.
  • Added the QPU topology tutorial demonstrating how to create, modify, and visualize quantum processing unit topologies using the QPU class.

Known Issues

  • Using OpenQASMTranspiler.batch_experiment with QASM programs that contain native measurement operations will lead to an unexpected shape of the returned data. To ensure the correct shape, measurement operations should be removed from the OpenQASM program, and .batch_experiment should be called with the option field add_measurement=True, which will add the measurement operations to the LabOne Q Experiment during the import step (see our tutorial for more details).
  • Using the internal scope to acquire raw traces on multiple channels of an SHFQA in a single experiment is only possible if the timing of all acquisitions is equal between instrument channels.
  • Using runtime checks of the sequencer playback through the disable_runtime_checks=False argument of session.connect(), is currently not possible when the experiment contains real-time feedback or is using the on-device PRNG. In the latter case, unintended error messages may be produced if the option is used.
  • When using the pipeliner in an experiment by specifying a chunk_count parameter in a sweep, the number of acquire commands in each chunk currently needs to be equal. Typically this means that the number of sweep steps within each chunk has to be the same.
  • When using OutputSimulator or pulse sheet viewer with an experiment using the pipeliner or near-time sweeping, currently only the first sequence step will be displayed.
  • When delaying logical signal lines of type rf_signal via the delay_signal calibration property, all rf_signals on the same sequencer core must be set to the same delay.
  • When delaying logical signal lines on the SHFQA via the delay_signal calibration property, the delays for the measure and acquire line must be the same; the measure pulse delay is not added to the acquire pulse delay as on the UHFQA. We recommend to use port_delay for now.
  • When creating a section with very short content (below the device’s minimum waveform length), the compiler may fail to map the experiment to valid SeqC, and will generate an error. As a workaround in these cases, manually add delays to the sequence.

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