Quantumness and speedup limit of a qubit under transition frequency modulation

• URL: http://arxiv.org/abs/2206.07147v1
• Date: Tue, 14 Jun 2022 20:20:57 GMT
• Title: Quantumness and speedup limit of a qubit under transition frequency modulation
• Authors: Amin Rajabalinia, Mahshid Khazaei Shadfar, Farzam Nosrati, Ali Mortezapour, Roberto Morandotti and Rosario Lo Franco
• Abstract summary: We show the capability of a frequency-modulated qubit embedded in a leaky cavity to exhibit enhancement of its dynamical quantum features. We also find an evolution speedup of the qubit through proper manipulation of the modulation parameters of the driving field.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Controlling and maintaining quantum properties of an open quantum system along its evolution is essential for both fundamental and technological aims. We assess the capability of a frequency-modulated qubit embedded in a leaky cavity to exhibit enhancement of its dynamical quantum features. The qubit transition frequency is sinusoidally modulated by an external driving field. We show that a properly optimized quantum witness effectively identifies quantum coherence protection due to frequency modulation while a standard quantum witness fails. We also find an evolution speedup of the qubit through proper manipulation of the modulation parameters of the driving field. Importantly, by introducing a new figure of merit Rg, we discover that the relation between Quantum Speed Limit Time (QSLT) and non-Markovianity depends on the system initial state, which generalizes previous connections between these two dynamical features. The frequency-modulated qubit model thus manifests insightful dynamical properties with potential utilization against decoherence.

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