Quantum Noise Documentation¶
Contents:
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class
quantumnoise.Noise(sources=None)¶ Class for decoherence due to noise
Parameters: sources (list of Source) – A list of noise sources which contribute to decoherence. -
fdecay(t, Omw, N)¶ Decay function for a free evolving qubit. Omw is the dressed state splitting and N is the number of refocussing pi pulses.
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fdecayrabi(t, OmR, OmW)¶ Decay function for a driven evolution. OmR is the rabi frequency, Omw is the dressed state splitting.
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Tphi(Omw, N)¶ Dephasing time
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T2(Omw, N)¶ Coherence time
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T1(Omw)¶ Lifetime
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class
quantumnoise.Source(noise_func=None, Dx=1, Dz=1, sigma=0)¶ Class for a noise source
Parameters: - noise_func (function) – function of the noise PSD, its only input is the angular frequency w
- Dx (float) – sigma_x coupling strength of the qubit to its noise bath.
- Dz (float) – sigma_z coupling strength of the qubit to its noise bath.
- sigma (float) – Standard deviation of the noise PSD
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show(w_min, w_max)¶ Plots the noise spectrum
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quantumnoise.v_noise_macro(w)¶ Example PSD for voltage noise on the mascroscopic experiment.
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Sj : Thermal noise
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Ss : Noise out of the Voltage Generator (HV-40-16)
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Filter : Low pass butterworth filter
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Gauss : Noise source which was identified at 20 kHz, modeled by a gaussian
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quantumnoise.voltage_Dx(dzB, v, d, eta, Omw=0)¶ Sigmax coupling of voltage noise
Parameters: - dzB (Magnetic field gradient) –
- v (secular frequency) –
- d (distance to electrodes) –
- eta (geometric factor) –
- Omw (dressed state splitting) –
Notes
Omw can be neglected when v >> Omw, which is usually the case
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quantumnoise.voltage_Dz(dzB, v, d, eta, Omw=0, state='dressed')¶ Sigmaz coupling of voltage noise
Parameters: - dzB (float) – Magnetic field gradient
- v (float) – secular frequency
- d (float) – distance to electrodes
- eta (float) – geometric factor
- Omw (float) – dressed state splitting
- state (string, ["dressed", "clock", "bare"]) – the qubit’s state
Notes
Omw can be neglected when v >> Omw, which is usually the case