Add cls Qubit and QuantumRegister

src/quafu/benchmark/variational/brickwall_circuit.py

@@ -0,0 +1,34 @@
+from quafu.circuits.quantum_circuit import QuantumCircuit
+from numpy import random
+
+qubit_num = 6
+n_layers = 2
+
+
+def brickwall_layout_circuit(params, pbc=False):
+    """
+    `params` is for circuit trainable parameters
+    """
+    c = QuantumCircuit(qubit_num)
+    offset = 0 if pbc else 1
+    for j in range(n_layers):
+        for i in range(0, qubit_num - offset, 2):
+            c.cnot(i, (i + 1) % qubit_num)
+        for i in range(qubit_num):
+            c.rx(i, params[j, i, 0])
+        for i in range(1, qubit_num - offset, 2):
+            c.cnot(i, (i + 1) % qubit_num)
+        for i in range(qubit_num):
+            c.rx(i, params[j, i, 1])
+    return c
+
+
+def plot():
+    para = random.random((n_layers, qubit_num, 2))
+    qc = brickwall_layout_circuit(para)
+    qc.plot_circuit(title='Brickwall Layout for \nVariational Circuit',
+                    show=True,
+                    save=False,
+                    )
+
+plot()

src/quafu/benchmark/variational/ladder_circuit.py

@@ -27,5 +27,3 @@ def plot():
                     show=True,
                     save=False,
                     )
-
-plot()

src/quafu/circuits/qreg.py

@@ -0,0 +1,80 @@
+# (C) Copyright 2023 Beijing Academy of Quantum Information Sciences
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+class Qubit:
+    """
+    Representation of logical qubits.
+    """
+    def __init__(self, logic_pos: int, reg_name: str = None, label: str = None, ):
+        self.pos = logic_pos
+        self.reg_name = 'q' if reg_name is None else reg_name
+        self.label = self.reg_name if label is None else label
+        self.physical_info = None
+        self._depth = 0  # present depth
+
+    def __repr__(self):
+        return self.reg_name + '_%s' % self.pos
+
+    def load_physical_info(self, *args, **kwargs):
+        raise NotImplementedError
+
+    @property
+    def used(self):
+        return self._depth > 0
+
+    def add_depth(self, num: int = 1):
+        self._depth += num
+
+    def move_pos(self, new_pos):
+        old_pos = 0 + self.pos
+        self.pos = new_pos
+        return old_pos
+
+
+class QuantumRegister:
+    """
+    Collection of Qubit(s)
+    """
+    def __init__(self, num: int = 0, name: str = None):
+        self.name = name
+        self.qubits = {i: Qubit(logic_pos=i, reg_name=name) for i in range(num)}
+
+    def __getitem__(self, item):
+        return self.qubits[item]
+
+    def __len__(self):
+        return len(self.qubits)
+
+    def __add__(self, other: 'QuantumRegister'):
+        qreg = QuantumRegister(name=self.name)
+        qreg.qubits = {**{self.qubits}, **{i + len(self): qubit for i, qubit in other.qubits.item()}}
+        return QuantumRegister(len(self) + len(other), name=self.name)
+
+    def exchange(self, p1, p2):
+        pass
+
+
+if __name__ == '__main__':
+    # q0 = Qubit(0)
+    # q1 = Qubit(1)
+    # reg = {q.pos: q for q in [q0, q1]}
+    # print(reg)
+    #
+    # reg[0], reg[1] = reg[1], reg[0]
+    # reg[0].pos, reg[1].pos = reg[1].pos, reg[0].pos
+    #
+    # print(reg)
+    # print([q0.pos, q1.pos])
+    reg = QuantumRegister(4, name='reg')
+    print(reg[3])