2018/01/07 by Ali Mortezapour, Mortezapour, Ali, Rosario Lo Franco +1 · 2 citations
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum Physics (quant-ph)
paper · pdf · doi:10.48550/arxiv.1801.02165
openalex publication_date 2018/01/07 · openalex created_date 2022/10/05 · openalex updated_date 2026/07/28
Finding strategies to preserve quantum resources in open systems is nowadays\na main requirement for reliable quantum-enhanced technologies. We address this\nissue by considering structured cavities embedding qubits driven by a control\ntechnique known as frequency modulation. We first study a single qubit in a\nlossy cavity to determine optimal modulation parameters and qubit-cavity\ncoupling regime allowing a gain of four orders of magnitude concerning\ncoherence lifetimes. We relate this behavior to the inhibition of the qubit\neffective decay rate rather than to stronger memory effects (non-Markovianity)\nof the system. We then exploit these findings in a system of noninteracting\nqubits embedded in separated cavities to gain basic information about\nscalability of the procedure. We show that the determined modulation parameters\nenable lifetimes of quantum resources, such as entanglement, discord and\ncoherence, three orders of magnitude longer than their natural (uncontrolled)\ndecay times. We discuss the feasibility of the system within the circuit-QED\nscenario, typically employed in the current quantum computer prototypes. These\nresults provide new insights towards efficient experimental strategies against\ndecoherence.\n