Long coherence times for Rydberg qubits on a superconducting atom chip

C. Hermann-Avigliano (1) , R. Celistrino Teixeira (2) , T. L. Nguyen (1) , T. Cantat-Moltrecht (1) , Gilles Nogues (3) , I. Dotsenko (4, 1) , S. Gleyzes (1) , J. M. Raimond (1) , S. Haroche (1) , M. Brune (1)

1 LKB [Collège de France] - Laboratoire Kastler Brossel
2 LINCS - Laboratory of Information, Network and Communication Sciences
3 NEEL - NPSC - Nanophysique et Semiconducteurs
4 LKB (Lhomond) - Laboratoire Kastler Brossel

Superconducting atom chips and Rydberg atoms are promising tools for quantum information processing operations based on the dipole blockade effect. Nevertheless, one has to face the severe problem of stray electric fields in the vicinity of the chip. We demonstrate a simple method circumventing this problem. Microwave spectroscopy reveals extremely long coherence lifetimes (in the millisecond range) for a qubit stored in a Rydberg level superposition close to the chip surface. This is an essential step for the development of quantum simulation with Rydberg atoms and of a hybrid quantum information architecture based on atomic ensembles and superconducting circuits.

Mots clés: Physique quantique; atom chip; superconducting magnetic trap; Rydberg

Domaines: Physique Quantique [quant-ph]

C. Hermann-Avigliano, R. Celistrino Teixeira, T. L. Nguyen, T. Cantat-Moltrecht, Gilles Nogues, et al.. Long coherence times for Rydberg qubits on a superconducting atom chip. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2014, 90 (4), pp.040502. ⟨10.1103/PhysRevA.90.040502⟩. ⟨hal-01052819⟩