Addressed qubit manipulation in radio-frequency dressed lattices

Abstract

Precise control over qubits encoded as internal states of ultracold atoms in arrays of potential wells is a key element for atomtronics applications in quantum information, quantum simulation and atomic microscopy. Here we theoretically study atoms trapped in an array of radio-frequency dressed potential wells and propose a scheme for engineering fast and high-fidelity single-qubit gates with low error due to cross-talk. In this proposal, atom trapping and qubit manipulation relies exclusively on long-wave radiation making it suitable for atom-chip technology. We demonstrate that selective qubit addressing with resonant microwaves can be programmed by controlling static and radio-frequency currents in microfabricated conductors. These results should enable studies of neutral-atom quantum computing architectures, powered by low-frequency electromagnetic fields with the benefit of simple schemes for controlling individual qubits in large ensembles.

Ultracold atoms in multiple radio-frequency dressed adiabatic potentials

“…Independent control over both the polarisation and amplitude of each RF component permits further manipulations, for example to connect our two trapping potentials at different locations through the spatial variation of the coupling strength. The MRF technique can also be combined with existing proposals to produce AP lattices using microstructured arrays of conductors [50,51], or provide a means of independent species-selective confinement for mixtures of atomic species with different g F values [23].…”

Microwave spectroscopy of radio-frequency-dressedRb87

“…(18), which can be obtained by expressing the interactionĤ MW in the dressed basis. Explicitly, this calculation corresponds to finding [24]…”

Advances in atomtronics

“…Some of these porposals have already been realized in experiments [15][16][17]. There are several reasons to investigate these types of systems: the transport characteristics in novel systems can be studied [18], the inherent matter-wave characteristics of these systems could lead to high precision measurement applications [19], in a computational context, the coherent current dynamics could allow for additional information to be imprinted on the current carrier's internal quantum states and finally, these platforms might also find themselves integrated into quantum computing architectures [20].…”