title: Quantum State Transmission in a Superconducting Charge Qubit-Atom Hybrid.
abstract: Hybrids consisting of macroscopic superconducting circuits and microscopic components, such as atoms and spins, have the potential of transmitting an arbitrary state between different quantum species, leading to the prospective of high-speed operation and long-time storage of quantum information. Here we propose a novel hybrid structure, where a neutral-atom qubit directly interfaces with a superconducting charge qubit, to implement the qubit-state transmission. The highly-excited Rydberg atom located inside the gate capacitor strongly affects the behavior of Cooper pairs in the box while the atom in the ground state hardly interferes with the superconducting device. In addition, the DC Stark shift of the atomic states significantly depends on the charge-qubit states. By means of the standard spectroscopic techniques and sweeping the gate voltage bias, we show how to transfer an arbitrary quantum state from the superconducting device to the atom and vice versa.
authors.affiliation: Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore.
authors.forename: Deshui
authors.initials: D
authors.lastname: Yu
authors.affiliation: Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore.
authors.forename: María Martínez
authors.initials: MM
authors.lastname: Valado
authors.affiliation: Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore.
authors.forename: Christoph
authors.initials: C
authors.lastname: Hufnagel
authors.affiliation: Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore.|Institute of Advanced Studies, Nanyang Technological University, 60 Nanyang View, Singapore 639673, Singapore.|National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616, Singapore.|MajuLab, CNRS-UNS-NUS-NTU International Joint Research Unit, UMI 3654, Singapore.
authors.forename: Leong Chuan
authors.initials: LC
authors.lastname: Kwek
authors.affiliation: Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore.|CNR-MATIS-IMM &Dipartimento di Fisica e Astronomia, Universitá Catania, Via S. Soa 64, 95127 Catania, Italy.|INFN Laboratori Nazionali del Sud, Via Santa Sofia 62, I-95123 Catania, Italy.
authors.forename: Luigi
authors.initials: L
authors.lastname: Amico
authors.affiliation: Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore.|Division of Physics and Applied Physics, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore.
authors.forename: Rainer
authors.initials: R
authors.lastname: Dumke