Coupling Josephson qubits via a current-biased information bus

Abstract

Josephson qubits without direct interaction can be effectively coupled by sequentially connecting them to an information bus: a current-biased large Josephson junction treated as an oscillator with adjustable frequency. The coupling between any qubit and the bus can be controlled by modulating the magnetic flux applied to that qubit. This tunable and selective coupling provides two-qubit entangled states for implementing elementary quantum logic operations, and for experimentally testing Bell's inequality.

10 pages, 1 figure. submitted

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Cited by in corpus (13)

• Qubit-induced phonon blockade as a signature of quantum behavior in nanomechanical resonators
• Controllable coupling between flux qubits
• Scalable superconducting qubit circuits using dressed states
• Quantum transducers: Integrating Transmission Lines and Nanomechanical Resonators via Charge Qubits
• Preparation of macroscopic quantum superposition states of a cavity field via coupling to a superconducting charge qubit
• Tomographic measurements on superconducting qubit states
• Macroscopic Einstein-Podolsky-Rosen pairs in superconducting circuits
• Measuring the quality factor of a microwave cavity using superconduting qubit devices
• Testing Bell's inequality in constantly coupled Josephson circuits by effective single-qubit operations
• On the generation of multipartite entangled states in Josephson architectures
• Testing tripartite Mermin inequalities by spectral joint-measurements of qubits
• High efficiency tomographic reconstruction of quantum states by quantum nondemolition measurements
• Transient spectrum of a single-Cooper-pair box with binomial states