cirq.ops.MeasurementGate

A gate that measures qubits in the computational basis.

Inherits From: Gate

Used in the notebooks

Used in the tutorials

The measurement gate contains a key that is used to identify results of measurements.

ValueError If the length of invert_mask is greater than num_qubits. or if the length of qid_shape doesn't equal num_qubits.

Methods

controlled

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Returns a controlled version of this gate. If no arguments are specified, defaults to a single qubit control.

num_controls: Total number of control qubits. control_values: For which control qubit values to apply the sub gate. A sequence of length num_controls where each entry is an integer (or set of integers) corresponding to the qubit value (or set of possible values) where that control is enabled. When all controls are enabled, the sub gate is applied. If unspecified, control values default to 1. control_qid_shape: The qid shape of the controls. A tuple of the expected dimension of each control qid. Defaults to (2,) * num_controls. Specify this argument when using qudits.

full_invert_mask

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Returns the invert mask for all qubits.

If the user supplies a partial invert_mask, this returns that mask padded by False.

Similarly if no invert_mask is supplies this returns a tuple of size equal to the number of qubits with all entries False.

num_qubits

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The number of qubits this gate acts on.

on

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Returns an application of this gate to the given qubits.

Args
*qubits The collection of qubits to potentially apply the gate to.

validate_args

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Checks if this gate can be applied to the given qubits.

By default checks that:

  • inputs are of type Qid
  • len(qubits) == num_qubits()
  • qubit_i.dimension == qid_shape[i] for all qubits

Child classes can override. The child implementation should call super().validate_args(qubits) then do custom checks.

Args
qubits The sequence of qubits to potentially apply the gate to.

Throws:

  • ValueError: The gate can't be applied to the qubits.

with_bits_flipped

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Toggles whether or not the measurement inverts various outputs.

with_key

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Creates a measurement gate with a new key but otherwise identical.

with_probability

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wrap_in_linear_combination

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__add__

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__call__

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Call self as a function.

__eq__

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__mul__

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__ne__

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__neg__

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__pow__

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__rmul__

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__sub__

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__truediv__

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