pygsti.protocols.rpe
RPE Protocol objects
Module Contents
Classes
Experimental design for robust phase estimation (RPE). |
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Robust phase estimation (RPE) protocol |
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Results from the RPE protocol |
Attributes
- class pygsti.protocols.rpe.RobustPhaseEstimationDesign(gate, req_lengths, sin_prep, sin_meas, sin_outcomes_pos, sin_outcomes_neg, cos_prep, cos_meas, cos_outcomes_pos, cos_outcomes_neg, *, qubit_labels=None, req_counts=None)
Bases:
pygsti.protocols.protocol.CircuitListsDesignExperimental design for robust phase estimation (RPE).
Produces an Experiment Design to test the phase that develops on a target gate, by applying it req_lengths times to a states prepared by sin_prep and cos_prep circuits, and then measured in the computational basis after (respective) action by sin_meas and cos_meas circuits. outcomes_pos and outcomes_neg determine which of those computational basis states count towards each of the probabilities
P^{γ’γ}_{Ns} = |<γ’ y| U^N |γ x>|² = |<γ’ x| U^N |-γ y>|² = (1 ± sin(θ))/2 P^{γ’γ}_{Nc} = |<γ’ x| U^N |γ x>|² = |<γ’ y| U^N | γ y>|² = (1 ± cos(θ))/2
(Computational basis state measurements in neither of these sets are silently dropped.)
In the above, the +x refers to the |E_0> + |E_1> combination of eigenstates of U, not of computational basis states. For instance, if U is rotation in the X basis, then cos_prep and cos_meas could be simply the identity:
|± U> = |0> ± |1>
where |±U> are the eigenstates of U, so that, in the notation of the above,
|+x> = |+U> + |-U> = |0>
The circuit would then calculate
P^+_{Nc} = |<+x| U^N | +x>|²
provided that cos_outcomes_pos = [0] and cos_outcomes_neg = [1].
Parameters
- gate<TODO typ>
<TODO description>
- req_lengths<TODO typ>
<TODO description>
- sin_prep<TODO typ>
<TODO description>
- sin_meas<TODO typ>
<TODO description>
- sin_outcomes_pos<TODO typ>
<TODO description>
- sin_outcomes_neg<TODO typ>
<TODO description>
- cos_prep<TODO typ>
<TODO description>
- cos_meas<TODO typ>
<TODO description>
- cos_outcomes_pos<TODO typ>
<TODO description>
- cos_outcomes_neg<TODO typ>
<TODO description>
Produces an Experiment Design to test the phase that develops on a target gate, by applying it req_lengths times to a states prepared by sin_prep and cos_prep circuits, and then measured in the computational basis after (respective) action by sin_meas and cos_meas circuits. outcomes_pos and outcomes_neg determine which of those computational basis states count towards each of the probabilities
P^{γ’γ}_{Ns} = |<γ’ y| U^N |γ x>|² = |<γ’ x| U^N |-γ y>|² = (1 ± sin(θ))/2 P^{γ’γ}_{Nc} = |<γ’ x| U^N |γ x>|² = |<γ’ y| U^N | γ y>|² = (1 ± cos(θ))/2
(Computational basis state measurements in neither of these sets are silently dropped.)
In the above, the +x refers to the |E_0> + |E_1> combination of eigenstates of U, not of computational basis states. For instance, if U is rotation in the X basis, then cos_prep and cos_meas could be simply the identity:
|± U> = |0> ± |1>
where |±U> are the eigenstates of U, so that, in the notation of the above,
|+x> = |+U> + |-U> = |0>
The circuit would then calculate
P^+_{Nc} = |<+x| U^N | +x>|²
provided that cos_outcomes_pos = [0] and cos_outcomes_neg = [1].
- class pygsti.protocols.rpe.RobustPhaseEstimation(name=None)
Bases:
pygsti.protocols.protocol.ProtocolRobust phase estimation (RPE) protocol
Create a new Protocol object.
Parameters
- namestr, optional
The name of this protocol, also used to (by default) name the results produced by this protocol. If None, the class name will be used.
Returns
Protocol
- parse_dataset(design, dataset)
<TODO summary>
Parameters
- design<TODO typ>
<TODO description>
- dataset<TODO typ>
<TODO description>
- compute_raw_angles(measured)
Determine the raw angles from the count data.
This corresponds to the angle of U^N, i.e., it is N times the phase of U.
Parameters
- measured<TODO typ>
<TODO description>
Returns
<TODO typ>
- run(data, memlimit=None, comm=None)
Run this protocol on data.
Parameters
- dataProtocolData
The input data.
- memlimitint, optional
A rough per-processor memory limit in bytes.
- commmpi4py.MPI.Comm, optional
When not
None, an MPI communicator used to run this protocol in parallel.
Returns
RobustPhaseEstimationResults
- class pygsti.protocols.rpe.RobustPhaseEstimationResults(data, protocol_instance, angle_estimates)
Bases:
pygsti.protocols.protocol.ProtocolResultsResults from the RPE protocol
Parameters
- data<TODO typ>
<TODO description>
- protocol_instance<TODO typ>
<TODO description>
- angle_estimates<TODO typ>
<TODO description>
Attributes
- angle_estimate<TODO typ>
<TODO description>
- measured_counts<TODO typ>
<TODO description>
- raw_angles<TODO typ>
<TODO description>
- Produce an RPE results object, providing access to
angle_estimates for each generation, and
the RPE-estimated angle, angle_estimate, from the last generation
- property angle_estimate
<TODO summary>
- property measured_counts
<TODO summary>
- property raw_angles
<TODO summary>
- pygsti.protocols.rpe.RPEDesign
- pygsti.protocols.rpe.RPE
- pygsti.protocols.rpe.RPEResults