Use new CUDA-Q noise models in examples (#120)

Signed-off-by: Ben Howe <[email protected]>

Author: bmhowe23

docs/sphinx/components/qec/introduction.rst

@@ -813,7 +813,7 @@ Function Variants
         # Memory circuit with noise model
         noise = cudaq.NoiseModel()
         # Configure noise
-        noise.add_all_qubit_channel("x", qec.TwoQubitDepolarization(0.01), 1)
+        noise.add_all_qubit_channel("x", cudaq.Depolarization2(0.01), 1)
         syndromes, measurements = qec.sample_memory_circuit(
             code,             # QEC code instance
             numShots=1000,    # Number of shots
@@ -889,7 +889,7 @@ Example of running a memory experiment:
 
         # Configure noise
         noise = cudaq.NoiseModel()
-        noise.add_all_qubit_channel("x", qec.TwoQubitDepolarization(0.01), 1)
+        noise.add_all_qubit_channel("x", cudaq.Depolarization2(0.01), 1)
 
         # Run memory experiment
         syndromes, measurements = qec.sample_memory_circuit(
@@ -930,7 +930,7 @@ Example of running a memory experiment:
 
           // Configure noise model
           cudaq::noise_model noise;
-          noise.add_all_qubit_channel("x", cudaq::qec::two_qubit_depolarization(0.1),
+          noise.add_all_qubit_channel("x", cudaq::depolarization2(0.1),
                               /*num_controls=*/1);
 
           // Run memory experiment
@@ -970,20 +970,20 @@ Additional Noise Models
      noise.add_all_qubit_channel('h', cudaq.BitFlipChannel(0.001))
 
      # Specify two qubit errors
-     noise.add_all_qubit_channel("x", qec.TwoQubitDepolarization(p), 1)
+     noise.add_all_qubit_channel("x", cudaq.Depolarization2(p), 1)
 
 .. tab:: C++
 
     .. code-block:: cpp
 
       cudaq::noise_model noise;
 
-      # Add multiple error channels
+      // Add multiple error channels
       noise.add_all_qubit_channel(
-          "x", cudaq::BitFlipChannel(/*probability*/ 0.01));
+          "x", cudaq::bit_flip_channel(/*probability*/ 0.01));
 
-      # Specify two qubit errors
+      // Specify two qubit errors
       noise.add_all_qubit_channel(
-          "x", cudaq::qec::two_qubit_depolarization(/*probability*/ 0.01),
+          "x", cudaq::depolarization2(/*probability*/ 0.01),
           /*numControls*/ 1);
 

docs/sphinx/examples/qec/cpp/circuit_level_noise.cpp

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2024 NVIDIA Corporation & Affiliates.                         *
+ * Copyright (c) 2024 - 2025 NVIDIA Corporation & Affiliates.                  *
  * All rights reserved.                                                        *
  *                                                                             *
  * This source code and the accompanying materials are made available under    *
@@ -46,9 +46,8 @@ int main() {
   cudaq::noise_model noise;
 
   // Add a depolarization noise channel after each cx gate
-  noise.add_all_qubit_channel(
-      "x", cudaq::qec::two_qubit_depolarization(/*probability*/ 0.01),
-      /*numControls*/ 1);
+  noise.add_all_qubit_channel("x", cudaq::depolarization2(/*probability*/ 0.01),
+                              /*numControls*/ 1);
 
   // Perform a noisy z-basis memory circuit experiment
   auto [syndromes, data] = cudaq::qec::sample_memory_circuit(

docs/sphinx/examples/qec/python/circuit_level_noise.py

@@ -22,7 +22,7 @@
 # error probabily
 p = 0.01
 noise = cudaq.NoiseModel()
-noise.add_all_qubit_channel("x", qec.TwoQubitDepolarization(p), 1)
+noise.add_all_qubit_channel("x", cudaq.Depolarization2(p), 1)
 
 # prepare logical |0> state, tells the sampler to do z-basis experiment
 statePrep = qec.operation.prep0

docs/sphinx/examples_rst/qec/circuit_level_noise.rst

@@ -49,7 +49,7 @@ Here's how to use CUDA-Q QEC to perform a circuit-level noise model experiment i
 
 3. Noise model:
     - To add noisy gates we use the `cudaq.NoiseModel` type.
-    - CUDA-Q supports the generation of arbitrary noise channels, but here we use a `qec.TwoQubitDepolarization` channel to add a depolarization channel.
+    - CUDA-Q supports the generation of arbitrary noise channels. Here we use a `cudaq.Depolarization2` channel to add a depolarization channel.
     - This is added to the `CX` gate by adding it to the `X` gate with 1 control.
     - This noisy gate is added to every qubit via that `noise.add_all_qubit_channel` function.