> ## Documentation Index
> Fetch the complete documentation index at: https://prod-mint.classiq.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Execution on C12 Quantum Cloud

[C12](https://www.c12qe.com/) is building scalable carbon-based quantum computers. Classiq supports execution on C12 QPU-emulators.

C12 simulator Callisto imitates the physical parameters of noise from C12's hardware. The fidelity parameters of the simulator can be accessed from C12's [documentation](https://c12qe.github.io/c12-callisto-clients/0.%20README.html).

## Configuration

C12 introduces several customizable hardware parameters:

### inilabel

The initial state specified using a binary label format, such as "00", "01", etc.

### inistatevector

The initial state vector for each qubit, provided as a comma-separated list of complex values.
Example: "1.+0.j, 0.+0.j, 0.+0.j, 0.+0.j"

Note: Either `inilabel` or `inistatevector` can be provided but not both.

### ininoisy

Indicates whether noisy initialization of the circuit should be used.

###

## Usage Example

If you are using [Classiq IDE](https://platform.classiq.io/), simply choose C12 in the checkbox menu under Execution page.

### Setting up Backend Preferences

[comment]: DO_NOT_TEST

```python theme={null}
from classiq.execution import C12BackendPreferences
from classiq import ExecutionPreferences, ExecutionSession, synthesize

backend_preferences = C12BackendPreferences(
    backend_name="c12sim-iswap",
    inilabel="00",  # Either inilabel or inistatevector must be provided
    # inistatevector="1.+0.j, 0.+0.j,", # Either inilabel or inistatevector must be provided
    ininoisy=True,
)

execution_preferences = ExecutionPreferences(
    num_shots=1000,
    backend_preferences=backend_preferences,
)
```

### Execute with ExecutionSession

Create your model, set execution preferences, synthesize, then run with `ExecutionSession`:

[comment]: DO_NOT_TEST

```python theme={null}
quantum_program = synthesize(your_model, preferences=preferences)

with ExecutionSession(quantum_program, execution_preferences) as session:
    result = session.sample()
```

## Supported Backends

* SIMULATOR = "Callisto Emulator"