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program.proto
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program.proto
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syntax = "proto3";
package cirq.google.api.v2;
option java_package = "com.google.cirq.google.api.v2";
option java_outer_classname = "ProgramProto";
option java_multiple_files = true;
// A quantum program.
message Program {
// The language in which the program is written.
Language language = 1;
// Programs can be specified by a circuit or a schedule.
oneof program {
// 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).
Circuit circuit = 2;
// Schedules are a list of operations (gates acting on qubits) that specify
// absolute start times for the operations.
Schedule schedule = 3;
}
// List to store global constants, such as strings used in many places.
// constants are referred to their index in this list, starting at zero.
repeated Constant constants = 4;
}
// Constants, such as long strings, that are used throughout the circuit.
// These constants can be stored here to save space.
message Constant {
oneof const_value {
string string_value = 1;
Circuit circuit_value = 2;
}
}
// The quantum circuit, specified as a series of moments (abstract
// slices of times with gates acting on disjoint sets of qubits).
message Circuit {
// How the circuit is scheduled.
enum SchedulingStrategy {
// The scheduling strategy is unspecified.
SCHEDULING_STRATEGY_UNSPECIFIED = 0;
// 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.
MOMENT_BY_MOMENT = 1;
}
SchedulingStrategy scheduling_strategy = 1;
// The moments of the circuit, with the first element corresponding to the
// first set of operations to apply, etc.
repeated Moment moments = 2;
}
// A moment is a collection of operations and circuit operations that operate
// on a disjoint set of qubits. Conceptually, a moment represents operations
// that all occur in the same finite period of time.
message Moment {
// All of the gate operations in the moment. Each operation and circuit
// operation must act on different qubits.
repeated Operation operations = 1;
// All of the circuit operations in the moment. Each operation and circuit
// operation must act on different qubits.
repeated CircuitOperation circuit_operations = 2;
}
// The quantum circuit, specified as a series of operations at specific
// start times.
message Schedule {
// A list of all the operations and their absolute start times.
repeated ScheduledOperation scheduled_operations = 3;
}
// An operation occurring at a specific start time.
message ScheduledOperation {
// Which operation is to be scheduled.
Operation operation = 1;
// 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.
int64 start_time_picos = 2;
}
// The language in which the program is expressed.
message Language {
// The name of the gate set being used.
//
// Valid names for the gate sets can be found in cirq/google/gate_sets.py.
string gate_set = 1;
// 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
string arg_function_language = 2;
}
// An operation acts on a set of qubits.
message Operation {
// Which gate this operation corresponds to.
Gate gate = 1;
// Map from the argument name to the Argument needed to fully specify
// the gate.
map<string, Arg> args = 2;
// Which qubits the operation acts on.
repeated Qubit qubits = 3;
// Token that can be used to specify a version of a gate.
// For instance, a gate that has been calibrated for a circuit.
//
// The token can be specified as a string or as a reference to
// the constant table of the circuit.
oneof token {
string token_value = 4;
int32 token_constant_index = 5;
}
}
// The instruction identifying the action taken on the quantum computer.
message Gate {
// Name for the Gate.
//
// These names must match those specified in the gate set. This is found
// in cirq/google/gate_sets.py.
string id = 1;
}
// An identifier for a qubit.
message Qubit {
// 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.
string id = 2;
}
// Arguments needed to specify a gate.
message 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.
//
// The argument can also be specified as a lookup in the Constant
// table of the Circuit.
oneof arg {
ArgValue arg_value = 1;
string symbol = 2;
ArgFunction func = 3;
int32 constant_index = 4;
}
}
// Value that can be passed as an argument to a gate.
message ArgValue {
oneof arg_value {
float float_value = 1;
RepeatedBoolean bool_values = 2;
string string_value = 3;
double double_value = 4;
}
}
// A repeated boolean value.
message RepeatedBoolean {
repeated bool values = 1;
}
// 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.
message ArgFunction {
// 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.
string type = 1;
// The arguments to the function.
repeated Arg args = 2;
}
// An operation that applies a modified version of a reference circuit. The
// circuit is stored in the top-level Constants table; the mappings in this
// object specify how that circuit should be modified for this operation.
//
// Multiple CircuitOperations may reference the same base circuit even if their
// mappings of that circuit are different.
message CircuitOperation {
// The index of the circuit in the top-level constant table.
int32 circuit_constant_index = 1;
// Specifier for repetitions of the circuit, which contains either a number
// of repetitions or a list of repetition IDs.
RepetitionSpecification repetition_specification = 2;
// Map from qubits in the "inner" circuit (referenced by
// circuit_constant_index) to qubits in the "outer" circuit (the one that
// contains this operation).
QubitMapping qubit_map = 3;
// Map of measurement keys in the "inner" circuit (referenced by
// circuit_constant_index) to measurement keys in the "outer" circuit (the
// one that contains this operation).
MeasurementKeyMapping measurement_key_map = 4;
// Map of args in the "inner" circuit (referenced by circuit_constant_index)
// to args in the "outer" circuit (the one that contains this operation).
ArgMapping arg_map = 5;
}
// A description of the repetitions of a subcircuit. IDs are used as suffixes
// for measurements in the repeated subcircuit; if repetition_count is given
// instead, the IDs will simply be the integers [0..N-1].
message RepetitionSpecification {
// An ordered list of IDs for a sequence of repetitions.
message RepetitionIds {
repeated string ids = 1;
}
oneof repetition_value {
// A list of unique IDs, one per repetition of the subcircuit.
RepetitionIds repetition_ids = 1;
// An integer number of repetitions to perform.
int32 repetition_count = 2;
}
}
// A mapping of qubits from one value to another. All mappings are applied
// simultaneously and independently; for example, [(a, b), (b, a)] will swap
// qubits a and b.
message QubitMapping {
// Indicates that qubit "key" should be replaced with "value".
message QubitEntry {
Qubit key = 1;
Qubit value = 2;
}
// A list of qubit mappings to apply.
repeated QubitEntry entries = 1;
}
// A key for matching a measurement event to its results.
message MeasurementKey {
string string_key = 1;
}
// A mapping of measurement keys from one value to another. All mappings are
// applied simultaneously and independently; for example, [(a, b), (b, a)] will
// swap measurement keys a and b.
message MeasurementKeyMapping {
// Indicates that measurement key "key" should be replaced with "value".
message MeasurementKeyEntry {
MeasurementKey key = 1;
MeasurementKey value = 2;
}
// A list of measurement key mappings to apply.
repeated MeasurementKeyEntry entries = 1;
}
// A mapping of args from one value to another. All mappings are applied
// simultaneously and independently; for example, [(a, b), (b, a)] will swap
// args a and b.
message ArgMapping {
// Indicates that arg "key" should be replaced with "value".
message ArgEntry {
Arg key = 1;
Arg value = 2;
}
// A list of arg mappings to apply.
repeated ArgEntry entries = 1;
}