Decoherence of a Driven Qubit

Abstract

We study decoherence of a field-driven qubit in the presence of environmental noises. For a general qubit, we find that driving, whether on-resonance or off-resonance, alters the qubit decoherence rates (including dissipation and pure dephasing), allowing both blue and red sideband contributions from the reservoir. Depending on the noise spectral density, driving field detuning and driving field phase shift, the qubit decoherence rates could be either accelerated or reduced. We apply our general theory to the system of an electron spin qubit that is confined in a quantum dot and driven by an in-plane electric field. We analyze how spin relaxation induced by the electrical noise due to electron-phonon interaction varies as a function of driving frequency, driving magnitude, driving field phase shift and spin-orbit coupling strengths.

12 pages, 7 figures

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• Coherence protection and decay mechanism in qubit ensembles under concatenated continuous driving
• Characterizing gate operations near the sweet spot of an exchange-only qubit
• Achieving High Fidelity Single Qubit Gates in a Strongly Driven Silicon Quantum Dot Hybrid Qubit
• High fidelity ac gate operations of the quantum dot hybrid qubit
• Combating fluctuations in relaxation times of fixed-frequency transmon qubits with microwave-dressed states
• Dephasing due to nuclear spins in large-amplitude electric dipole spin resonance
• Temporally correlated quantum noise in driven quantum systems
• A High-Power Clock Laser Spectrally Tailored for High-Fidelity Quantum State Engineering
• Long-range two-hybrid-qubit gates mediated by a microwave cavity with red sidebands
• Dynamical second-order noise sweetspots in resonantly driven spin qubits
• Spin-relaxation anisotropy in a nanowire quantum dot with strong spin-orbit coupling
• Spectral properties of a hybrid-qubit model based on a two-dimensional quantum dot