From 428d0f934e20755b7e30bd2f3775a4e98783693e Mon Sep 17 00:00:00 2001
From: Boxi Li <etamin1201@gmail.com>
Date: Sun, 11 Sep 2022 18:25:44 +0200
Subject: [PATCH 1/3] Add a minus sign for plotting the swap gate

---
 src/qutip_qip/circuit/circuit.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/qutip_qip/circuit/circuit.py b/src/qutip_qip/circuit/circuit.py
index 9ef5af7e..d0bad585 100644
--- a/src/qutip_qip/circuit/circuit.py
+++ b/src/qutip_qip/circuit/circuit.py
@@ -967,7 +967,7 @@ def latex_code(self):
                                 distance = abs(
                                     gate.targets[1] - gate.targets[0]
                                 )
-                                col.append(r" \qswap \qwx[%d] \qw" % distance)
+                                col.append(r" \qswap \qwx[-%d] \qw" % distance)
                                 _swap_processing = True
 
                             elif (

From 4e4657d5dd74af93659307ee524b0297fdd79031 Mon Sep 17 00:00:00 2001
From: Boxi Li <etamin1201@gmail.com>
Date: Sun, 11 Sep 2022 18:23:04 +0200
Subject: [PATCH 2/3] Add a border so that SWAP gates are not cropped.

---
 src/qutip_qip/circuit/circuit.py | 2 +-
 tests/test_circuit.py            | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/qutip_qip/circuit/circuit.py b/src/qutip_qip/circuit/circuit.py
index d0bad585..1285c6d9 100644
--- a/src/qutip_qip/circuit/circuit.py
+++ b/src/qutip_qip/circuit/circuit.py
@@ -1171,7 +1171,7 @@ def _to_qasm(self, qasm_out):
 
 
 _latex_template = r"""
-\documentclass{standalone}
+\documentclass[border=3pt]{standalone}
 \usepackage[braket]{qcircuit}
 \renewcommand{\qswap}{*=<0em>{\times}}
 \begin{document}
diff --git a/tests/test_circuit.py b/tests/test_circuit.py
index 157e581d..4a096848 100644
--- a/tests/test_circuit.py
+++ b/tests/test_circuit.py
@@ -667,7 +667,7 @@ def test_wstate(self):
                 assert sum(result_cbits[i]) == 1
 
     _latex_template = r"""
-\documentclass{standalone}
+\documentclass[border=3pt]{standalone}
 \usepackage[braket]{qcircuit}
 \renewcommand{\qswap}{*=<0em>{\times}}
 \begin{document}

From 47fa957aecd0d4c061726a44717f6decf5c027da Mon Sep 17 00:00:00 2001
From: Boxi Li <etamin1201@gmail.com>
Date: Sun, 11 Sep 2022 18:24:08 +0200
Subject: [PATCH 3/3] Remove the unnecessary redefinition of qswap

---
 src/qutip_qip/circuit/circuit.py | 1 -
 tests/test_circuit.py            | 1 -
 2 files changed, 2 deletions(-)

diff --git a/src/qutip_qip/circuit/circuit.py b/src/qutip_qip/circuit/circuit.py
index 1285c6d9..85c52147 100644
--- a/src/qutip_qip/circuit/circuit.py
+++ b/src/qutip_qip/circuit/circuit.py
@@ -1173,7 +1173,6 @@ def _to_qasm(self, qasm_out):
 _latex_template = r"""
 \documentclass[border=3pt]{standalone}
 \usepackage[braket]{qcircuit}
-\renewcommand{\qswap}{*=<0em>{\times}}
 \begin{document}
 \Qcircuit @C=1cm @R=1cm {
 %s}
diff --git a/tests/test_circuit.py b/tests/test_circuit.py
index 4a096848..b1bc8bde 100644
--- a/tests/test_circuit.py
+++ b/tests/test_circuit.py
@@ -669,7 +669,6 @@ def test_wstate(self):
     _latex_template = r"""
 \documentclass[border=3pt]{standalone}
 \usepackage[braket]{qcircuit}
-\renewcommand{\qswap}{*=<0em>{\times}}
 \begin{document}
 \Qcircuit @C=1cm @R=1cm {
 %s}