PulseShapes.py 文件源码

def CLEAR(amp=1, length=0, sigma=0, sampling_rate=1e9, **params):
    """
    Pulse shape to quickly deplete the cavity at the end of a measurement.
    measPulse followed by 2 steps of length step_length and amplitudes amp1, amp2.
    """
    if 'amp1' not in params:
        params['amp1'] = 0
    if 'amp2' not in params:
        params['amp2'] = 0
    if 'step_length' not in params:
        params['step_length'] = 100e-9
    timePts = (1.0 / sampling_rate) * np.arange(np.round((length-2*params['step_length']) * sampling_rate))
    flat_step = amp * (0.6 * np.exp(-timePts / sigma) + 0.4).astype(np.complex)
    numPts_clear_step = int(np.round(params['step_length'] * sampling_rate))
    clear_step_one = amp * params['amp1'] * np.ones(numPts_clear_step, dtype=np.complex)
    clear_step_two = amp * params['amp2'] * np.ones(numPts_clear_step, dtype=np.complex)
    return np.append(flat_step, [clear_step_one, clear_step_two])