laboneq.openqasm3

LabOne Q OpenQASM

Experimental

The current implementation of OpenQASM support is considered experimental. Its interface may change in future releases of LabOne Q.

What is supported?

LabOne Q currently aims to support OpenQASM 3.0 and the corresponding version of OpenPulse.

The list below outlines the features of OpenQASM. It follows the top-level headings of the OpenQASM specification for ease of reference. Unless otherwise mentioned, features are supported. Unsupported features and caveats are noted explicitly.

OpenQASM and OpenPulse feature support

• Comments
• Version string
• Included files
  • Caveats:
    • Only stdgates.inc may be imported.
  • Notes:
    • Importing stdgates.inc does not implement any gates. Implementations are supplied via the GateStore.
• Types and Casting
  • Quantum types
    • Qubits
    • Qubit aliasing (let)
    • Physical qubits
  • Classical types
    • Bool
    • Integer
    • Float
    • Complex
    • Duration
    • Discrete sets
    • Literal values for the above types
    • Constants
    • Angle (unsupported)
    • Array (unsupported)
    • Bit (unsupported)
    • Stretch (unsupported)
    • Caveats:
      • The classical type system is rudimentary. Types behave like equivalent Python types.
      • The built-in constants (pi, etc) and constant functions (arccos, arcsin, etc) are not implemented.
  • Operations:
    • Arithmetic (+, -, *, /)
    • Logical (||, &&)
    • Comparison (==, !=, <, <=, >, >=)
    • Unitary (-, !)
    • Indexing (e.g. q[1])
    • Concatenation (++)
    • Other operations (unsupported)
• Gates
  • Applying gates
    • Caveats:
      • Gate modifiers are not supported.
      • Gate durations are not yet supported.
      • Broadcasting is not yet supported.
  • Defining gates (unsupported)
    • Caveats:
      • The built-in gates U(θ, ϕ, λ) and gphase(γ) are not automatically implemented.
• Built-in quantum instructions
  • Initialization
    • reset supported via a user-supplied gate.
  • Measurement
    • measure supported via a user-supplied gate.
    • Caveats:
      • OpenQASM measurements return LabOne Q measurement handles. These handles can be used in externally defined functions and gates but cannot yet be used in branching statements within OpenQASM or assigned to arrays.
• Classical instructions
  • Low-level classical instructions
    • See the notes on classical types above.
  • Looping and branching
    • If-else statements
      • Caveats:
        • Branching is only supported on values known at compile time. This includes constants, inputs and expressions derived from them.
        • Branching on loop variables is not yet supported.
    • For loops
      • Caveats:
        • Only range declarations are currently supported for specifying the values to loop over.
        • Loop variables may typically only be used in places where a LabOne Q sweep parameter could be.
    • While loops (unsupported)
    • Breaking and continuing loops (unsupported)
    • Terminating the program early (unsupported)
  • The Switch statement (unsupported)
  • Extern function calls
    • In addition to returning values, extern functions may as a side-effect also return a LabOne Q section to be used within the experiment.
• Subroutines (unsupported)
• Scoping of variables
  • Global scope
  • Subroutine and gate scope
  • Block scope
  • Caveats:
    • The scope system is a simple hierarchical system and does not closely follow the scoping rules in the OpenQASM specification.
• Directives
  • Pragmas
    • See the section below for a list of LabOne Q specific pragmas.
  • Annotations (unsupported)
• Input/output
• Standard library
  • Caveats:
    • Importing stdgates.inc does not automatically define any gates.
• Circuit timing
  • Duration and stretch types
    • See notes on classical types above.
  • Operations on durations
    • See notes on classical types above.
  • Delays
  • Boxed expressions
  • Barrier instruction
• Pulse-level descriptions of gates and measurement
  • Inline calibration blocks
  • Restrictions on defcal bodies
  • Calibrations in practice
• OpenPulse Grammar
  • Ports
  • Frames
    • Frame Initialization (unsupported)
    • Frame Manipulation (partially supported)
  • Waveforms
  • Play instruction
  • Capture Instruction

Pragmas

LabOne Q specific pragmas all start with the prefix zi.. All other pragmas are ignored.

There is currently only a single pragma available:

• pragma zi.acquisition_type VALUE

  This sets the experiment AcquisitionType when an OpenQASM program is compiled to a LabOne Q experiment by exp_from_qasm. The value is case-insensitive and should match one of the acquisition type names (e.g. integration, spectroscopy, discrimination, raw).

  Example: pragma zi.acquisition_type spectroscopy

laboneq.openqasm3.gate_store

GateStore()

gate_map: Dict[str, str] = {} instance-attribute

gates: Dict[Tuple[str, Tuple[str, ...]], Callable[..., Section]] = {} instance-attribute

ports = {} instance-attribute

waveforms: Dict[str, Callable] = {} instance-attribute

lookup_gate(name, qubits, args=(), kwargs=None)

lookup_waveform(name)

map_gate(qasm_name, labone_q_name)

Define mapping from qasm gate name to LabOne Q gate name.

register_gate(name, qubit_name, pulse, signal, phase=None, id=None)

Register a pulse as a single-qubit gate.

register_gate_section(name, qubit_names, section_factory)

Register a LabOne Q section factory as a gate.

register_port(qasm_port, signal_line)

register_waveform(name, pulse)

laboneq.openqasm3.openqasm3_importer

exp_from_qasm(program, qubits, gate_store, inputs=None, externs=None, count=1, averaging_mode=AveragingMode.CYCLIC, acquisition_type=None, reset_oscillator_phase=False)

Create an experiment from an OpenQASM program.

Parameters:

Name	Type	Description	Default
program	str	OpenQASM program	required
qubits	dict[str, Qubit]	Map from OpenQASM qubit names to LabOne Q DSL Qubit objects	required
gate_store	GateStore	Map from OpenQASM gate names to LabOne Q DSL Gate objects	required
inputs	dict[str, Any] | None	Inputs to the OpenQASM program.	None
externs	dict[str, Callable] | None	Extern functions for the OpenQASM program.	None
count	int	The number of acquire iterations.	1
averaging_mode	AveragingMode	The mode of how to average the acquired data.	CYCLIC
acquisition_type	AcquisitionType | None	The type of acquisition to perform. The acquisition type may also be specified within the OpenQASM program using pragma zi.acqusition_type raw, for example. If an acquisition type is passed here, it overrides any value set by a pragma. If the acquisition type is not specified, it defaults to AcquisitionType.INTEGRATION.	None
reset_oscillator_phase	bool	When true, reset all oscillators at the start of every acquistion loop iteration.	False

Returns:

Type	Description
Experiment	The experiment generated from the OpenQASM program.

exp_from_qasm_list(programs, qubits, gate_store, inputs=None, externs=None, count=1, averaging_mode=AveragingMode.CYCLIC, acquisition_type=AcquisitionType.INTEGRATION, reset_oscillator_phase=False, repetition_time=0.001, batch_execution_mode='pipeline', do_reset=False, add_measurement=True, pipeline_chunk_count=None)

Process a list of openQASM programs into a single LabOne Q experiment that executes the QASM snippets sequentially.

At this time, the QASM programs should not include any measurements. By default, we automatically append a measurement of all qubits to the end of each program. This behavior may be changed by specifying add_measurement=False.

The measurement results for each qubit are stored in a handle named f'meas{qasm_qubit_name}' where qasm_qubit_name is the key specified for the qubit in the qubits parameter.

Optionally, a reset operation on all qubits is prepended to each program. The duration between the reset and the final readout is fixed and must be specified as repetition_time. It must be chosen large enough to accommodate the longest of the programs. The repetition_time parameter is also required if the resets are disabled. In a future version we hope to make an explicit repetition_time optional.

For the measurement we require the gate store to be loaded with a measurement gate. Similarly, the optional reset requires a reset gate to be available.

Note that using set_frequency or specifying the acquisition type via a pragma zi.acquisition_type statement within an OpenQASM program is not supported by exp_from_qasm_list. It will log a warning if these are encountered.

Parameters:

Name	Type	Description	Default
programs	list[str]	the list of the QASM snippets	required
qubits	dict[str, Qubit]	Map from OpenQASM qubit names to LabOne Q DSL Qubit objects	required
gate_store	GateStore	Map from OpenQASM gate names to LabOne Q DSL Gate objects	required
inputs	dict[str, Any] | None	Inputs to the OpenQASM program.	None
externs	dict[str, Callable] | None	Extern functions for the OpenQASM program.	None
count	int	The number of acquire iterations.	1
averaging_mode	AveragingMode	The mode of how to average the acquired data.	CYCLIC
acquisition_type	AcquisitionType	The type of acquisition to perform.	INTEGRATION
reset_oscillator_phase	bool	When true, reset all oscillators at the start of every acquistion loop iteration.	False
repetition_time	float	The length that any single program is padded to.	0.001
batch_execution_mode	str	The execution mode for the sequence of programs. Can be any of the following: "nt": The individual programs are dispatched by software. "pipeline": The individual programs are dispatched by the sequence pipeliner. "rt": All the programs are combined into a single real-time program. "rt" offers the fastest execution, but is limited by device memory. In comparison, "pipeline" introduces non-deterministic delays between programs of up to a few 100 microseconds. "nt" is the slowest.	'pipeline'
do_reset	bool	If True, an active reset operation is added to the beginning of each program.	False
add_measurement	bool	If True, add measurement at the end for all qubits used.	True
pipeline_chunk_count	int | None	The number of pipeline chunks to divide the experiment into. The default chunk count is equal to the number of programs, so that there is one program per pipeliner chunk. Future versions of LabOne Q may use a more sophisticated default based on the program sizes. Currently the number of programs must be a multiple of the chunk count so that there are the same number of programs in each chunk. This limitation will be removed in a future release of LabOne Q. A ValueError is raised if the number of programs is not a multiple of the chunk count.	None

Returns:

Type	Description
Experiment	The experiment generated from the OpenQASM programs.