- Bug Fixes
Fixed a bug that overwrote <ParameterSweep>[“evals”] data with transition data when using plot_transitions().
Fixed proper integration of ParameterSweep into CentralDispatch, enabling proper warnings to the user when internal computed sweep data is out of sync with associated quantum system parameters.
Fixed a bug that could occur when a ParameterSweep was applied to a HilbertSpace object involving only a single subsystem.
- Under the Hood
Enable use of weakref in CentralDispatch for proper garbage collection.
Extended pytests to basic CentralDispatch functionality
New graphical user interface
scqubits.GUI()illustrating single-qubit functionality of scqubits.
NamedSlotsNdarrayas a convenient subclass of ndarray with name-based and value-based slicing, and immediate support for basic plots
Added functionality for extracting dispersive energy parameters (such as Kerr coupling strengths)
Improved support for transition plots (subsystem transitions, sidebands etc.)
GenericQubit(two-level system) so that toy models such as the Jaynes-Cummings model can be readily realized with
phioperators to the Oscillator class
Added helper methods
New and enhanced interface for defining interaction terms in HilbertSpace objects via
Added option to input interaction as a
Qobj, or specify interaction terms as string expressions; also represented in
ZeroPiis now faster, thanks to a correction to the expression for the grid spacing in discretization.py.
ParameterSweepclass, now allowing for multi-dimensional parameter sweeps
Added a warning describing
total=Truebeing the default in t1 calculations
- Bug fixes
Fix to type conversion error affecting the
numberoperator in operators.py
Rectified orientation of
matrix2dplots to match axes labels
modeoption for values displayed in matrix element plots was ignored
New support for higher-order stencils in discretized derivatives.
Improved formatting of
__str__methods (called when “printing” an scqubits class instance).
Under the hood: use of Python 3.6 compatible type annotations; unified formatting enabled by the
Improvements to fileIO speeding up operations (increased memore cache) and requiring less disk space (avoid literal redundancies in stored data).
- Bug fixes
<qubit>.create()failed in jupyter notebooks due to missing image files
bug fix: corrected the form of the quasiparticle noise operator
- Major changes/additions
Coherence calculations for the majority of qubits. These allow for estimating coherence times and rates due to various noise channels.
A new units system: users can specify energy units of their system Hamiltonian. These units are automatically considered when plotting and in coherence time calculations.
Separated documentation and example jupyter notebooks into individual repositories, see scqubits-doc and scqubits-examples.
- Minor changes/additions
Introduced tests for real-valuedness of zero-pi Hamiltonians (for speedup).
New options in plotting (e.g. grid).
- Bug fixes
Fixed bug preventing the proper disabling of the progress bar.
Various bug fixes and improvements of file IO operations.
Fixed issue with color legend bar in .plot_matrixelements.
Bug fix: the
FullZeroPiHamiltonian was incorrect in the case of nonzero
improvement: thanks to adjusted ARPACK options, diagonalization should be noticeably faster for
dillthe default for multiprocessing.
Bug fix: implementation of the
InteractionTerminvolved a bug that could lead to incorrect results
update to plotting routines now supports various extra plotting options such as
TunableTransmonclass for flux-tunable transmon, including junction asymmetry
limit support to Python >= 3.6
corrections to documentation of
added missing jupyter notebook illustrating use of
overhaul of file IO system now allows saving and loading various scqubit data via a custom h5 file format
ipywidget support for creating qubits inside jupyter (try, for example,
tmon = scqubits.Transmon.create())
update to the setup script to properly include testing data with the PyPi release.
- Major changes/additions
scqubits now offers multiprocessing support for a number of methods.
Introduced checks ensuring that umbrella objects like
ParameterSweepinstances do not accidentally go “out-of-sync” with respect to their basic components. When needed, warnings are thrown for the user to re-run sweeps or spectrum lookups.
- Under the hood:
Monitoring for changes of interdependent class instances is implemented through a central dispatch system. (disable:
HilbertSpacereference from within InteractionTerm (throws deprecation warning if still used)
list; composition changes to
HilbertSpacewarrant generating a new
DataStoreas general purpose parent class to
No longer store custom data inside
fixed a bug in display of
InteractionTermworks in tandem with
HilbertSpaceto ease setup of composite systems with pairwise interactions
ParameterSweepclass efficiently generates spectral data for performing a scan of a
HilbertSpaceobject over an external parameters
Explorerclass introduces interactive plots (see docs and demo ipynb)
cleaned up implementation of file Serializable operations