Dynamical control of two-level system's decay and long time freezing

Abstract

We investigate with exact numerical calculation coherent control of a two-level quantum system's decay by subjecting the two-level system to many periodic ideal $2\pi$ phase modulation pulses. For three spectrum intensities (Gaussian, Lorentzian, and exponential), we find both suppression and acceleration of the decay of the two-level system, depending on difference between the spectrum peak position and the eigen frequency of the two-level system. Most interestingly, the decay of the two-level system freezes after many control pulses if the pulse delay is short. The decay freezing value is half of the decay in the first pulse delay.

6 pages, 6 figures, published in Phys. Rev. A

References in corpus (3)

• Universal pulse sequence to minimize spin dephasing in the central spin decoherence problem
• Long-time electron spin storage via dynamical suppression of hyperfine-induced decoherence in a quantum dot
• Dynamical control of electron spin coherence in a quantum dot

Cited by in corpus (2)

• Towards optimized suppression of dephasing in systems subject to pulse timing constraints
• Quantum Zeno and anti-Zeno effects induced by either frequent measurements, modulations, or a mix of them