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# Simulate

POST https://api.conductorquantum.com/v0/coda/tools/simulate
Content-Type: application/json

Run a quantum circuit simulation and return results. Supports qasm (sampling), statevector, and density_matrix methods with CPU or GPU backends.

Reference: https://docs.conductorquantum.com/api-reference/coda-api/tools/simulate

## Authentication

- `Authorization` header (bearer token, required) — Bearer authentication of the form `Bearer <token>`, where token is your auth token.

## Request

### Body (application/json)

This endpoint expects a SimulateRequest.

- `code` (string, required) — Python code containing the quantum circuit
- `method` (enum, optional, default: qasm) — Simulation method
  - Allowed values: `qasm`, `statevector`, `density_matrix`
- `shots` (integer, optional, default: 1024)
- `seed_simulator` (integer, optional, nullable)
- `backend` (enum, optional, default: auto) — Simulation backend
  - Allowed values: `aer`, `cudaq`, `auto`

## Response

### 200

Successful Response

- `success` (boolean, required)
- `method` (string, optional)
- `backend` (string, optional)
- `shots` (integer, optional)
- `counts` (map from string to integer, optional)
- `probabilities` (map from string to double, optional)
- `statevector` (list of list of double, optional)
- `density_matrix` (list of list of list of double, optional)
- `circuit_depth` (integer, optional)
- `circuit_gate_count` (integer, optional)

## Errors

### 422 Unprocessable Entity Error

Validation Error

- `detail` (list of ValidationError, optional)

## Types

### ValidationError

- `loc` (list of ValidationErrorLocItems, required)
- `msg` (string, required)
- `type` (string, required)
- `input` (any, optional)
- `ctx` (ValidationErrorCtx, optional)

### ValidationErrorLocItems

### ValidationErrorCtx

## Examples

**Request**

```json
{
  "body": {
    "code": "from qiskit import QuantumCircuit\nqc = QuantumCircuit(2)\nqc.h(0)\nqc.cx(0, 1)\nqc.measure_all()",
    "method": "qasm",
    "shots": 1024
  }
}
```

**Response**

```json
{
  "success": true,
  "method": "qasm",
  "backend": "aer",
  "shots": 1024,
  "counts": {
    "11": 515,
    "00": 509
  },
  "probabilities": {
    "11": 0.5029,
    "00": 0.4971
  },
  "circuit_depth": 3,
  "circuit_gate_count": 3,
  "plan": "free"
}
```

**SDK Code**

```python conductorquantum
from conductorquantum import ConductorQuantum

client = ConductorQuantum(token="<token>")
result = client.coda.tools.simulate(
    code="from qiskit import QuantumCircuit\nqc = QuantumCircuit(2)\nqc.h(0)\nqc.cx(0, 1)\nqc.measure_all()",
    method="qasm",
    shots=1024,
)
print(result)
```

```javascript
const url = 'https://api.conductorquantum.com/v0/coda/tools/simulate';
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: '{"body":{"code":"from qiskit import QuantumCircuit\nqc = QuantumCircuit(2)\nqc.h(0)\nqc.cx(0, 1)\nqc.measure_all()","method":"qasm","shots":1024}}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.conductorquantum.com/v0/coda/tools/simulate"

	payload := strings.NewReader("{\n  \"body\": {\n    \"code\": \"from qiskit import QuantumCircuit\\nqc = QuantumCircuit(2)\\nqc.h(0)\\nqc.cx(0, 1)\\nqc.measure_all()\",\n    \"method\": \"qasm\",\n    \"shots\": 1024\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://api.conductorquantum.com/v0/coda/tools/simulate")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"body\": {\n    \"code\": \"from qiskit import QuantumCircuit\\nqc = QuantumCircuit(2)\\nqc.h(0)\\nqc.cx(0, 1)\\nqc.measure_all()\",\n    \"method\": \"qasm\",\n    \"shots\": 1024\n  }\n}"

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://api.conductorquantum.com/v0/coda/tools/simulate")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"body\": {\n    \"code\": \"from qiskit import QuantumCircuit\\nqc = QuantumCircuit(2)\\nqc.h(0)\\nqc.cx(0, 1)\\nqc.measure_all()\",\n    \"method\": \"qasm\",\n    \"shots\": 1024\n  }\n}")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://api.conductorquantum.com/v0/coda/tools/simulate', [
  'body' => '{
  "body": {
    "code": "from qiskit import QuantumCircuit\\nqc = QuantumCircuit(2)\\nqc.h(0)\\nqc.cx(0, 1)\\nqc.measure_all()",
    "method": "qasm",
    "shots": 1024
  }
}',
  'headers' => [
    'Authorization' => 'Bearer <token>',
    'Content-Type' => 'application/json',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://api.conductorquantum.com/v0/coda/tools/simulate");
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", "Bearer <token>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"body\": {\n    \"code\": \"from qiskit import QuantumCircuit\\nqc = QuantumCircuit(2)\\nqc.h(0)\\nqc.cx(0, 1)\\nqc.measure_all()\",\n    \"method\": \"qasm\",\n    \"shots\": 1024\n  }\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = [
  "Authorization": "Bearer <token>",
  "Content-Type": "application/json"
]
let parameters = ["body": [
    "code": "from qiskit import QuantumCircuit
qc = QuantumCircuit(2)
qc.h(0)
qc.cx(0, 1)
qc.measure_all()",
    "method": "qasm",
    "shots": 1024
  ]] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://api.conductorquantum.com/v0/coda/tools/simulate")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```