package tfq.proto

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Arguments needed to specify a gate.

Used in: ArgFunction, Operation

• oneof arg

  Arguments are either a number, a symbol, or an argument function (which recursively depends on Arg). ArgValue is used to specify an argument that does not vary depending on RunContext. Symbol is used when an argument will be resolved (supplied a value) by a Run Context. Functions are used to define a simple s-expression tree describing how to combine numbers and symbols mathematically.

  • ArgValue arg_value = 1

  • string symbol = 2

  • ArgFunction func = 3

A function of arguments. This is an s-expression tree representing mathematically the function being evaluated. What language is supported is specified by the arg_function_language in the language message.

Used in: Arg

• string type = 1

  The name of the function. I.e. if the function is the sum of two symbols, this could be '+', and the args would be two string symbol values. Valid values for the type are given in cirq/google/arg_func_langs.py and must be consistent with the arg_function_language specified in the language field of the program.

• repeated Arg args = 2

  The arguments to the function.

Value that can be passed as an argument to a gate.

Used in: Arg

• oneof arg_value

  • float float_value = 1

  • RepeatedBoolean bool_values = 2

  • string string_value = 3

  • double double_value = 4

The quantum circuit, specified as a series of moments (abstract slices of times with gates acting on disjoint sets of qubits).

Used in: Program

• Circuit.SchedulingStrategy scheduling_strategy = 1

• repeated Moment moments = 2

  The moments of the circuit, with the first element corresponding to the first set of operations to apply, etc.

How the circuit is scheduled.

Used in: Circuit

• SCHEDULING_STRATEGY_UNSPECIFIED = 0

  The scheduling strategy is unspecified.

• MOMENT_BY_MOMENT = 1

  Each operation in a moment starts at the same time. The start of the next moment is given by the duration of the longest operation in the current moment.

The instruction identifying the action taken on the quantum computer.

Used in: Operation

• string id = 1

  Name for the Gate. These names must match those specified in the gate set. This is found in cirq/google/gate_sets.py.

The language in which the program is expressed.

Used in: Program

• string gate_set = 1

  The name of the gate set being used. Valid names for the gate sets can be found in cirq/google/gate_sets.py.

• string arg_function_language = 2

  The language supported by ArgFunctions. These specifies what allowed ArgFunction types there are. Valid names for the arg function language can be found in cirq/google/arg_func_langs.py

A moment is a collection of operations that operate on a disjoint set of qubits. Conceptually a moment represents operations that all occurring the same finite period of time.

Used in: Circuit

• repeated Operation operations = 1

  All of the operations in the moment. Each operation must act on different qubits.

An operation acts on a set of qubits.

Used in: Moment, ScheduledOperation

• optional Gate gate = 1

  Which gate this operation corresponds to.

• map<string, Arg> args = 2

  Map from the argument name to the Argument needed to fully specify the gate.

• repeated Qubit qubits = 3

  Which qubits the operation acts on.

Store a pauli acting on a particular qubit.

Used in: PauliTerm

• string qubit_id = 1

• string pauli_type = 2

Store the sum of simpler terms.

• repeated PauliTerm terms = 1

Store a term which is a coefficient of some number of tensored up paulis.

Used in: PauliSum

• float coefficient_real = 1

• float coefficient_imag = 2

• repeated PauliQubitPair paulis = 3

A quantum program.

• optional Language language = 1

  The language in which the program is written.

• oneof program

  Programs can be specified by a circuit or a schedule.

  • Circuit circuit = 2

    A circuit is an abstract representation as a series of moments, each moment having a set of gates that act on disjoint qubits. Circuits don't have absolute times for their operations (gates acting on qubits).

  • Schedule schedule = 3

    Schedules are a list of operations (gates acting on qubits) that specify absolute start times for the operations.

Store a single projection.

Used in: ProjectorTerm

• string qubit_id = 1

• bool basis_state = 2

  False means |0> and true means |1>.

Store the sum of simpler terms.

• repeated ProjectorTerm terms = 1

Store a term which is a coefficient and the qubits of the projection.

Used in: ProjectorSum

• float coefficient_real = 1

• float coefficient_imag = 2

• repeated ProjectorDictEntry projector_dict = 3

An identifier for a qubit.

Used in: Operation

• string id = 2

  Id of the qubit. These depend on the device being scheduled upon. Typically ids for qubits on a line are simple string versions of integers, while for qubits on a square grid these are integers separated by a underscore, i.e. '0_1', '1_2', etc.

A repeated boolean value.

Used in: ArgValue

• repeated bool values = 1

The quantum circuit, specified as a series of operations at specific start times.

Used in: Program

• repeated ScheduledOperation scheduled_operations = 3

  A list of all the operations and their absolute start times.

An operation occurring at a specific start time.

Used in: Schedule

• optional Operation operation = 1

  Which operation is to be scheduled.

• int64 start_time_picos = 2

  The start time of the operation, with zero representing the absolute start of the circuit. This must be consistent with the moment structure and must be positive.