All Abstracts | Poster Abstracts | Talk Abstracts | Tutorial Abstracts

Quantum manipulation of low-frequency fluctuators by a superconducting resonator

Lin Tian, University of California, Merced

(Session : Thursday from )

Abstract. Spurious ``two-level system fluctuators'' (TLS's) are usually considered a serious source of low-frequency noise in superconducting qubits. Most recently, coherent coupling between TLS's and superconducting phase qubits was observed via the novel energy splittings in spectroscopic measurements. It was shown that the TLS's have much longer decoherence times than the superconducting qubits, making them potential candidates for quantum information processing. Located sparsely inside solid-state devices, TLS's usually do not interact with each other, and their states are hard to control. In this work, we show that universal quantum gates can be realized in these two-level systems solely by tuning the mode of the superconducting resonator in which they are imbedded. Taking into account the decay of the resonator, our numerical simulations show that the gates can be realized with high fidelity even when the decay of the resonator is a few megahertz. The nonlocal nature of the superconducting resonator mode also makes this system intrinsically scalable.