Superconducting circuits and trapped ions are promising architectures for quantum information processing. However, the natural frequencies for controlling these systems---radio-frequency ion control and microwave domain superconducting qubit control---make direct Hamiltonian interactions between them weak. In this paper we describe a technique for coupling a trapped ion's motion to the fundamental mode of a superconducting circuit, by applying to the circuit a carefully modulated external magnetic flux. In conjunction with a nonlinear element (Josephson junction), this gives the circuit an effective time-dependent inductance. We then show how to tune the external flux to generate a resonant coupling between the circuit and ion's motional mode and discuss the limitations of this approach compared to using a time-dependent capacitance.Superconducting circuits and trapped ions are promising architectures for quantum information processing. However, the natural frequencies for controlling these systems---radio-frequency ion control and microwave domain superconducting qubit control---make direct Hamiltonian interactions between them weak. In this paper we describe a technique for coupling a trapped ion's motion to the fundamental mode of a superconducting circuit, by applying to the circuit a carefully modulated external magnetic flux. In conjunction with a nonlinear element (Josephson junction), this gives the circuit an effective time-dependent inductance. We then show how to tune the external flux to generate a resonant coupling between the circuit and ion's motional mode and discuss the limitations of this approach compared to using a time-dependent capacitance.

arXiv:1504.03993Physical Review AJan 14, 20164 citations

Superconducting Integrated Circuits

Thomas Y. Hsiang

Elsevier eBooksJan 1, 19851 citation

Superconducting qubits can be coupled and addressed as trapped ions

Yu-xi Liu, L. F. Wei, J. R. Johansson +2 more

Exploiting the intrinsic nonlinearity of superconducting Josephson junctions, we propose a scalable circuit with superconducting qubits (SCQs) which is very similar to the successful one now being used for trapped ions. The SCQs are coupled to the ``vibrational'' mode provided by a superconducting $LC$ circuit or its equivalent (e.g., a superconducting quantum interference device). Both single-qubit rotations and qubit- $LC$ -circuit couplings and/or decouplings can be controlled by the frequencies of the time-dependent magnetic fluxes. The circuit is scalable since the qubit-qubit interactions, mediated by the $LC$ circuit, can be selectively performed, and the information transfer can be realized in a controllable way.Exploiting the intrinsic nonlinearity of superconducting Josephson junctions, we propose a scalable circuit with superconducting qubits (SCQs) which is very similar to the successful one now being used for trapped ions. The SCQs are coupled to the ``vibrational'' mode provided by a superconducting $LC$ circuit or its equivalent (e.g., a superconducting quantum interference device). Both single-qubit rotations and qubit-$LC$-circuit couplings and/or decouplings can be controlled by the frequencies of the time-dependent magnetic fluxes. The circuit is scalable since the qubit-qubit interactions, mediated by the $LC$ circuit, can be selectively performed, and the information transfer can be realized in a controllable way.

arXiv:cond-mat/0509236Physical Review BOct 31, 200762 citations

Parametric coupling with superconducting circuits

Xueying Jin, Florent Lecocq, Katarina Cicak +5 more

Bulletin of the American Physical SocietyMar 7, 20180 citations

Collective coupling in hybrid superconducting circuits

Shiro Saito

Bulletin of the American Physical SocietyMar 13, 20170 citations

Experimental system design for the integration of trapped-ion and superconducting qubit systems

De Motte, Anton Grounds, Marian Rehak +8 more

We present a design for the experimental integration of ion trapping and superconducting qubit systems as a step towards the realization of a quantum hybrid system. The scheme addresses two key difficulties in realizing such a system; a combined microfabricated ion trap and superconducting qubit architecture, and the experimental infrastructure to facilitate both technologies. Developing upon work by Kielpinski et al. [1] we describe the design, simulation and fabrication process for a microfabricated ion trap capable of coupling an ion to a superconducting microwave LC circuit with a coupling strength in the tens of kHz. We also describe existing difficulties in combining the experimental infrastructure of an ion trapping setup into a dilution fridge with superconducting qubits and present solutions that can be immediately implemented using current technology.We present a design for the experimental integration of ion trapping and superconducting qubit systems as a step towards the realization of a quantum hybrid system. The scheme addresses two key difficulties in realizing such a system; a combined microfabricated ion trap and superconducting qubit architecture, and the experimental infrastructure to facilitate both technologies. Developing upon work by Kielpinski et al. [1] we describe the design, simulation and fabrication process for a microfabricated ion trap capable of coupling an ion to a superconducting microwave LC circuit with a coupling strength in the tens of kHz. We also describe existing difficulties in combining the experimental infrastructure of an ion trapping setup into a dilution fridge with superconducting qubits and present solutions that can be immediately implemented using current technology.

arXiv:1510.07298Oct 25, 20151 citation

LC

circuit or its equivalent (e.g., a superconducting quantum interference device). Both single-qubit rotations and qubit-

LC

-circuit couplings and/or decouplings can be controlled by the frequencies of the time-dependent magnetic fluxes. The circuit is scalable since the qubit-qubit interactions, mediated by the

LC

circuit, can be selectively performed, and the information transfer can be realized in a controllable way.