Spectroscopic and Analog Measurements of Qubits

The protocols in the module qubit_spectroscopy are closer to analog protocols than gate based QCVV protocols.

• Qubit spectroscopy: \(T_1\) measurement example
  • Generate simultaneous \(T_1\) experiments
  • Acquire data
  • Analyze and plot
• Qubit spectroscopy: \(T_2^*\) (Ramsey) and \(T_2\)-echo (Hahn echo) measurement example
  • \(T_2^*\) Experiment
    • Generate simultaneous \(T_2^*\) experiments
    • Acquire data
    • Analyze and plot
  • \(T_2\)-echo experiment
    • Acquire data
    • Analyze and plot
• Qubit spectroscopy: Rabi measurement example
  • Generate simultaneous Rabi experiments on all qubits
  • Acquire data
  • Analyze and plot
• Qubit spectroscopy: CZ Ramsey measurement example
  • Generate CZ Ramsey experiments
  • Acquire data
  • Analyze and plot

General Functions

acquire_qubit_spectroscopy_data(qc, …)	A standard data acquisition method for all experiments in this module.
get_stats_by_qubit(expt_results)	Organize the mean and std_err of a single-observable experiment by qubit.
do_t1_or_t2(qc, qubits, times, kind, …)	A wrapper around experiment generation, data acquisition, and estimation that runs a t1, t2 echo, or t2* experiment on each qubit in qubits and returns the rb_decay along with the experiments and results.

T1

generate_t1_experiments(qubits, times)	Return a ObservablesExperiment containing programs which constitute a t1 experiment to measure the decay time from the excited state to ground state for each qubit in qubits.
fit_t1_results(times, z_expectations, …)	Wrapper for fitting the results of a T1 experiment for a single qubit; simply extracts key parameters and passes on to the standard fit.

T2

generate_t2_star_experiments(qubits, times, …)	Return ObservablesExperiments containing programs which constitute a T2 star experiment to measure the T2 star coherence decay time for each qubit in qubits.
generate_t2_echo_experiments(qubits, times, …)	Return ObservablesExperiments containing programs which constitute a T2 echo experiment to measure the T2 echo coherence decay time.
fit_t2_results(times, y_expectations, …)	Wrapper for fitting the results of a ObservablesExperiment; simply extracts key parameters and passes on to the standard fit.

Rabi

generate_rabi_experiments(qubits, angles)	Return ObservablesExperiments containing programs which constitute a Rabi experiment.
fit_rabi_results(angles, z_expectations, …)	Wrapper for fitting the results of a rabi experiment on a qubit; simply extracts key parameters and passes on to the standard fit.

CZ phase Ramsey

generate_cz_phase_ramsey_experiments(…)	Return ObservablesExperiments containing programs that constitute a CZ phase ramsey experiment.
fit_cz_phase_ramsey_results(angles, …)	Wrapper for fitting the results of a ObservablesExperiment; simply extracts key parameters and passes on to the standard fit.