Changelog

Stay up to date with the latest Boulder Opal release notes

Boulder Opal 19.0.0

August 3, 2022

Breaking changes

• We have removed the following deprecated graph operations and parameters:
• The graph operations graph.pwc_operator_hermitian_part and graph.stf_operator_hermitian_part have been deprecated in favor of the unified operation graph.hermitian_part.
• The parameter cut_off_frequency of the operation graph.sinc_convolution_kernel has been deprecated in favor of cutoff_frequency.

What's new

• We have added two non-graph pulses to the pulse library:
• The message alerting you when there's a new version of the Q-CTRL Python package available now also contains a URL to this Changelog page.

Boulder Opal 18.9.0

July 27, 2022

Bug fixes

• We've fixed an authentication issue when using qctrl commands in the terminal.

July 25, 2022

Boulder Opal 18.7.0

July 11, 2022

What's new

• The graph operation density_matrix_evolution_pwc, which you can use to simulate the evolution of open systems, now can also accept Tensors for Lindblad operators. This means that now you can pass the output of other graph operations as the Lindblad terms that describe the evolution of the open system.

Boulder Opal 18.6.0

June 22, 2022

What's new

We've created the Boulder Opal Toolkits (beta), built on top of the existing Boulder Opal functions and graph operations, to provide convenience functions, nodes, and classes that enable you to develop and implement workflows faster and with less code. You can access these toolkit operations from the corresponding namespaces in the Qctrl or Graph object (for example, qctrl.utils.confidence_ellipse_matrix or graph.pulses.gaussian_pulse_pwc). You can find more information about these in the toolkit topic and their reference documentation.

Please note that the toolkits are currently in beta phase of development. Breaking changes may be introduced.

The main toolkit capabilities include:

Boulder Opal 18.4.0

June 14, 2022

What's new

• We have added two new graph operations for calculating the minimum and the maximum values of a tensor.

Boulder Opal 18.3.0

May 30, 2022

What's new

• We have added two new graph operations for creating operators in composite Hilbert spaces:
• The operation embed_operators creates operators in a composite Hilbert space by calculating the tensor product of operators in subsystems with the appropriate identity operators.
• The operation kronecker_product_list performs the sequential tensor product of a list of operators.

Boulder Opal 18.2.0

May 16, 2022

What’s new

• We've added simpler ways to create common operations of quantum mechanics:
• The new operation number_operator creates the number operator in the Fock space.
• The operation pauli_matrix now can also create the raising and lowering matrices.
• We've added the operation ms_phases_multitone to calculate the phases produced by a Mølmer–Sørensen gate created with a multitone global beam.
• We've added the unified graph operation hermitian_part for taking the Hermitian part of any of the data types used in our graphs (Tensors, PWCs, or STFs).
• You can now pass any kind of SciPy sparse matrix format to graph operations that use sparse matrices, such as density_matrix_evolution_pwc.

Boulder Opal 18.1.0

April 26, 2022

What’s new

• We've added new graph operations to create Pauli operators.

Boulder Opal 18.0.0

April 14, 2022

Breaking changes

• We’ve removed support for Python 3.6.

What’s new

• We’ve added support for Python 3.10.
• We’ve added new graph operations to work with quantum harmonic oscillator-like systems. You can use them to easily create states and operators in Fock spaces.
• The cut_off_frequency parameter in the sinc_convolution_kernel node is now deprecated and will be removed in the future. Please use cutoff_frequency instead.