Coupling of Josephson current qubits using a connecting loop
arXiv:cond-mat/0305127 · doi:10.1103/PhysRevB.70.184525
Abstract
We propose a coupling scheme for the three-Josephson junction qubits which uses a connecting loop, but not mutual inductance. Present scheme offers the advantages of a large and tunable level splitting in implementing the controlled-NOT (CNOT) operation. We calculate the switching probabilities of the coupled qubits in the CNOT operations and demonstrate that present CNOT gate can meet the criteria for the fault-tolerant quantum computing. We obtain the coupling strength as a function of the coupling energy of the Josephson junction and the length of the connecting loop which varies with selecting two qubits from the scalable design.
5 pages with updates, version to appear in Phys. Rev. B
References in corpus (8)
- Coherent Quantum Dynamics of a Superconducting Flux Qubit
- A Superconducting Persistent Current Qubit
- Quantum oscillations in two coupled charge qubits
- Demonstration of conditional gate operation using superconducting charge qubits
- Information and Computation: Classical and Quantum Aspects
- Persistent current in superconducting nanorings
- Variable electrostatic transformer: controllable coupling of two charge qubits
- Double-Well Potentials in Current Qubits
Cited by in corpus (12)
- Controllable coupling of superconducting flux qubits
- Interqubit coupling mediated by a high-excitation-energy quantum object
- Switchable resonant coupling of flux qubits
- Constructive Quantum Shannon Decomposition from Cartan Involutions
- Macroscopic Greenberger-Horne-Zeilinger and W States in Flux Qubits
- Controllable Coupling in Phase-Coupled Flux Qubits
- Entanglement and Bell States in Superconducting Flux Qubits
- Scalable quantum computing model in the circuit-QED lattice with circulator function
- Quantum Down Conversion and Multipartite Entanglement via a Mesoscopic SQUID Ring
- Macroscopic Many-Qubit Interactions in Superconducting Flux Qubits
- Circulator function in a Josephson junction circuit and braiding of Majorana zero modes
- Current biased gradiometric flux qubit in a circuit-QED architecture