Previous post: Support for other Simulators and Noise Final post: Concluding my GSoC ’22 project Restructuring the Backend The Pulse simulator backends were restructured to be more general. Now, instead of having different classes for different processor models, there is only one class QiskitPulseSimulator which takes as an argument processor. …

Previous post: LinearSpinChain Backend Next post: Restructuring the Pulse Simulators and starting Documentation Density Matrix Support Now the pulse simulators support density matrices as results. Hence, when noise is applied and the result is in density matrix format (mixed state), the results can be parsed. In case the output is given in ket…

Previous post: Setting up Pulse simulators Next post: Support for other Simulators and Noise Adding the LinearSpinChain Pulse Processor I made the pulse simulator backend based on the LinearSpinChain model. The backend works almost the same way as the circuit simulator backend except: After the conversion from qiskit's QuantumCircuit to qutip's QubitCircuit, the circuit is…

Previous post: Backend Options Next post: LinearSpinChain Backend Minor changes Some minor changes as requested in the PR: (a) Raising RuntimeError instead of Exception when allow_custom_gate=False(b)Using Counter instead of manually counting shots. Added tests for Measurements in a circuit: We set a predefined seed for random and calculate and compare the measurement…

Previous post: Getting ready for the first merge Next post: Setting up Pulse simulators Configurable Options Shots An option to configure shots was added to the QiskitCircuitSimulator backend. This samples measurements from the obtained probability distribution. The shots can be configured while running a circuit on the backend as follows: job = backend.run(circuit, shots=500) By default, if the option is not provided, the circuit runs for 1024 shots.

Previous post: Tests Next post: Backend Options Changes this week Made a few minor changes and improvements as suggested by Boxi Li. These can be found in the comments here. Removed the warnings during circuit conversion. Instead an attribute stores the warnings which can be printed if needed. Fixed bug in get_counts(). Added…

Previous post: Parsing Results Next post: Getting ready for the first merge Tests I started writing tests for the backends. Currently I have written tests for testing the circuit conversion for single qubit gate circuits and two qubit gate circuits. Some improvements and bug fixes Removed a redundant statevector calculation. Made variable naming scheme better and explicitly mentioned argument and return types for functions

Previous post: The Circuit Converter Next post: Tests Parsing results Earlier, the objects being returned from the backends were in qutip_qip’s statevector format (Qobj). These needed to be parsed into the qiskit Result format. This was done. Measurements Support for measurements was added to the backend. Inheritance The Job, Provider and Backend classes now…

Previous post: The Qiskit Skeleton Next post: Parsing Results Converter To use qutip-qip’s simulators, qiskit’s QuantumCircuit object needs to be converted to a QubitCircuit object. This is what I did this week. Implementation Details In the backend class, we iterate over the QuantumCircuit's circuit.data in which each entry is an instruction (gate). Each…