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---
title: euler_angles_1q
description: API reference for qiskit.quantum_info.euler_angles_1q
in_page_toc_min_heading_level: 1
python_api_type: function
python_api_name: qiskit.quantum_info.euler_angles_1q
---
<span id="qiskit-quantum-info-euler-angles-1q" />
# qiskit.quantum\_info.euler\_angles\_1q
<Function id="qiskit.quantum_info.euler_angles_1q" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.16/qiskit/quantum_info/synthesis/two_qubit_decompose.py" signature="euler_angles_1q(unitary_matrix)">
DEPRECATED: Compute Euler angles for a single-qubit gate.
Find angles (theta, phi, lambda) such that unitary\_matrix = phase \* Rz(phi) \* Ry(theta) \* Rz(lambda)
**Parameters**
**unitary\_matrix** (*ndarray*) 2x2 unitary matrix
**Returns**
(theta, phi, lambda) Euler angles of SU(2)
**Return type**
tuple
**Raises**
**QiskitError** if unitary\_matrix not 2x2, or failure
</Function>