From d9efb4d29e9f9d5e678e751a9ba45394352e32dc Mon Sep 17 00:00:00 2001
From: Jake Lishman <jake.lishman@ibm.com>
Date: Fri, 22 Sep 2023 11:43:39 +0100
Subject: [PATCH] Remove spurious `SXGate._ARRAY` (#10876)

* Remove spurious `SXGate._ARRAY`

This was left in only as a mistake during the writing of #10296;
originally the `with_gate_array` decorator didn't exist and all classes
had manual `_ARRAY` specifiers, but `SXGate`'s got left in accidentally
when all the rest were removed in favour of the decorator.

* Remove unused import
---
 qiskit/circuit/library/standard_gates/sx.py | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/qiskit/circuit/library/standard_gates/sx.py b/qiskit/circuit/library/standard_gates/sx.py
index 49fbb11c558c..6f144fed82a6 100644
--- a/qiskit/circuit/library/standard_gates/sx.py
+++ b/qiskit/circuit/library/standard_gates/sx.py
@@ -14,7 +14,6 @@
 
 from math import pi
 from typing import Optional, Union
-import numpy
 from qiskit.circuit.controlledgate import ControlledGate
 from qiskit.circuit.singleton_gate import SingletonGate
 from qiskit.circuit.quantumregister import QuantumRegister
@@ -146,10 +145,6 @@ class SXdgGate(SingletonGate):
                     = e^{-i pi/4} \sqrt{X}^{\dagger}
 
     """
-    _ARRAY = numpy.array(
-        [[0.5 - 0.5j, 0.5 + 0.5j], [0.5 + 0.5j, 0.5 - 0.5j]], dtype=numpy.complex128
-    )
-    _ARRAY.setflags(write=False)
 
     def __init__(self, label: Optional[str] = None, duration=None, unit=None, _condition=None):
         """Create new SXdg gate."""