qrisp.QuantumCircuit.get_depth_dic

QuantumCircuit.get_depth_dic() → dict[Qubit, int]

Returns the depth of each qubit in this QuantumCircuit.

The circuit is transpiled before the depth is evaluated, so that composite gates are fully decomposed into primitive operations. The depth of a qubit is the length of the longest sequential chain of operations acting on it, where every operation contributes a depth of 1.

Returns:

dict[Qubit, int]

A dictionary mapping each Qubit to its depth.

See also

QuantumCircuit.depth

Returns the overall circuit depth (i.e. the maximum value in this dictionary).

Examples

We create a QuantumCircuit and inspect the per-qubit depth:

>>> from qrisp import QuantumCircuit
>>> qc = QuantumCircuit(3)
>>> qc.h(0)
>>> qc.cx(0, 1)
>>> qc.x(1)
>>> qc.get_depth_dic()
{Qubit(qb_0): 2, Qubit(qb_1): 3, Qubit(qb_2): 0}

qb_0 has depth 2 (H followed by CX), qb_1 has depth 3 (CX followed by X), and qb_2 is idle so its depth is 0.