PulseSystemModel
PulseSystemModel(hamiltonian=None, qubit_freq_est=None, meas_freq_est=None, u_channel_lo=None, control_channel_labels=None, subsystem_list=None, dt=None)
Physical model object for pulse simulator.
This class contains model information required by the PulseSimulator. It contains:
"hamiltonian": aHamiltonianModelobject representing the Hamiltonian of the system."qubit_freq_est"and"meas_freq_est": optional default values for qubit and measurement frequencies."u_channel_lo": A description ofControlChannellocal oscillator frequencies in terms of qubit local oscillator frequencies."control_channel_labels": Optional list of identifying information for eachControlChannelthat the model supports."subsystem_list": List of subsystems in the model."dt": Sample width size for OpenPulse instructions.
A model can be instantiated from the helper function duffing_system_model(), or using the PulseSystemModel.from_backend() constructor.
Example
Constructing from a backend:
Initialize a PulseSystemModel.
Parameters
- hamiltonian (HamiltonianModel) – The Hamiltonian of the system.
- qubit_freq_est (list) – list of qubit lo frequencies defaults to be used in simulation if none are specified in the PulseQobj.
- meas_freq_est (list) – list of qubit meas frequencies defaults to be used in simulation if none are specified in the PulseQobj.
- u_channel_lo (list) – list of ControlChannel frequency specifications.
- control_channel_labels (list) – list of labels for control channels, which can be of any type.
- subsystem_list (list) – list of valid qubit indicies for the model.
- dt (float) – pixel size for pulse Instructions.
Raises
AerError – if hamiltonian is not None or a HamiltonianModel
Methods
calculate_channel_frequencies
PulseSystemModel.calculate_channel_frequencies(qubit_lo_freq=None)
Calculate frequencies for each channel given qubit_lo_freq.
Parameters
qubit_lo_freq (list or None) – list of qubit linear oscillator drive frequencies. If None these will be calculated using self._qubit_freq_est.
Returns
a dictionary of channel frequencies.
Return type
OrderedDict
Raises
ValueError – If channel or u_channel_lo are invalid.
control_channel_index
PulseSystemModel.control_channel_index(label)
Return the index of the control channel with identifying label.
Parameters
label (Any) – label that identifies a control channel
Returns
index of the ControlChannel
Return type
int or None
from_backend
classmethod PulseSystemModel.from_backend(backend, subsystem_list=None)
Returns a PulseSystemModel constructed from an OpenPulse enabled backend object.
Parameters
- backend (Backend) – backend object to draw information from.
- subsystem_list (list) – a list of ints for which qubits to include in the model.
Returns
the PulseSystemModel constructed from the backend.
Return type
Raises
AerError – If channel or u_channel_lo are invalid.