Module backend_qx

class QIBackend(num_runs=1024, verbose=0, quantum_inspire_api=None, backend_type=None)[source]

Bases: BasicEngine

Backend for Quantum Inspire

Initialize the Backend object.

Parameters:

num_runs (int) – Number of runs to collect statistics (default is 1024).
verbose (int) – Verbosity level, defaults to 0, which produces no extra output.
quantum_inspire_api (QuantumInspireAPI | None) – Connection to QI platform, optional parameter.
backend_type (int | str | None) – Backend to use for execution. When no backend_type is provided, the default backend will be used.

Raises:

AuthenticationError – When an authentication error occurs.

property one_qubit_gates: Tuple[Any, ...]: Return the one qubit gates as a tuple

property two_qubit_gates: Tuple[Any, ...]: Return the two qubit gates as a tuple

property three_qubit_gates: Tuple[Any, ...]: Return the three qubit gates as a tuple

cqasm()[source]

Return cQASM code that is generated last.

Return type:: str

property qasm: str: Return qasm code at any moment in the process.

is_available(cmd)[source]

Via this method the ProjectQ framework determines which commands (gates) are available in the backend.

Parameters:: cmd (Command) – Command with a gate for which to check availability.
Returns:: True when the gate in the command is available on the Quantum Inspire backend.
Return type:: bool

get_probabilities(qureg)[source]

Return the list of basis states with corresponding probabilities.

The measured bits are ordered according to the supplied quantum register, i.e., the left-most bit in the state-string corresponds to the first qubit in the supplied quantum register.

Warning

Only call this function after the circuit has been executed!

Parameters:: qureg (List[Qubit]) – Quantum register of size n determining the contents of the probability states.
Returns:: Dictionary mapping n-bit strings of 0 and 1 to probabilities.
Raises:: RuntimeError – If no data is available (i.e., if the circuit has not been executed). Or if a qubit was supplied which was not present in the circuit (might have gotten optimized away).
Return type:: Dict[str, float]

get_probabilities_multiple_measurement(qureg)[source]

For each measurement block return the basis states with corresponding probabilities.

The measured bits are ordered according to the supplied quantum register, i.e., the left-most bit in the state-string corresponds to the first qubit in the supplied quantum register.

Warning

Only call this function after the circuit has been executed!

Parameters:: qureg (List[Qubit]) – Quantum register of size n determining the contents of the probability states.
Returns:: List of dictionaries mapping n-bit strings of 0 and 1 to probabilities for each measurement block.
Raises:: RuntimeError – If no data is available (i.e., if the circuit has not been executed). Or if a qubit was supplied which was not present in the circuit (might have gotten optimized away).
Return type:: List[Dict[str, float]]

receive(command_list)[source]

Receives a command list and, for each command, stores it until completion.

Parameters:: command_list (List[Command]) – List of commands to execute.
Return type:: None