Sign- and magnitude-tunable coupler for superconducting flux qubits

Abstract

We experimentally confirm the functionality of a coupling element for flux-based superconducting qubits, with a coupling strength $J$ whose sign and magnitude can be tuned {\it in situ}. To measure the effective $J$, the groundstate of a coupled two-qubit system has been mapped as a function of the local magnetic fields applied to each qubit. The state of the system is determined by directly reading out the individual qubits while tunneling is suppressed. These measurements demonstrate that $J$ can be tuned from antiferromagnetic through zero to ferromagnetic.

Updated text and figures

References in corpus (2)

• Controllable coupling of superconducting flux qubits
• Mediated tunable coupling of flux qubits

Cited by in corpus (60)

• Quantum Computing
• Microwave photonics with superconducting quantum circuits
• Natural and artificial atoms for quantum computation
• Qubit architecture with high coherence and fast tunable coupling
• Perspectives of quantum annealing: Methods and implementations
• A simple all-microwave entangling gate for fixed-frequency superconducting qubits
• A tunable coupling scheme for implementing high-fidelity two-qubit gates
• Architectural considerations in the design of a superconducting quantum annealing processor
• Realization of high-fidelity CZ and ZZ-free iSWAP gates with a tunable coupler
• Arbitrary accuracy iterative phase estimation algorithm as a two qubit benchmark
• Adiabatic Quantum Simulation of Quantum Chemistry
• Realizable Hamiltonians for Universal Adiabatic Quantum Computers
• Tunable coupling in circuit quantum electrodynamics with a superconducting V-system
• Fluxonium: an alternative qubit platform for high-fidelity operations
• On the construction of model Hamiltonians for adiabatic quantum computation and its application to finding low energy conformations of lattice protein models
• Noisy intermediate-scale quantum computers
• Tuneable hopping and nonlinear cross-Kerr interactions in a high-coherence superconducting circuit
• Demonstration of a Tuneable Coupler for Superconducting Qubits Using Coherent, Time Domain, Two-Qubit Operations
• Non-perturbative k-body to two-body commuting conversion Hamiltonians and embedding problem instances into Ising spins
• A scalable readout system for a superconducting adiabatic quantum optimization system
• Tunable coupler for realizing a controlled-phase gate with dynamically decoupled regime in a superconducting circuit
• Coherent coupled qubits for quantum annealing
• Generating entanglement between microwave photons and qubits in multiple cavities coupled by a superconducting qutrit
• A Compound Josephson Junction Coupler for Flux Qubits With Minimal Crosstalk
• Surface code with decoherence: An analysis of three superconducting architectures
• RFSQUID-Mediated Coherent Tunable Coupling Between a Superconducting Phase Qubit and a Lumped Element Resonator
• High-fidelity CZ gate for resonator-based superconducting quantum computers
• Probing Noise in Flux Qubits via Macroscopic Resonant Tunneling
• Synchronization dynamics on the picosecond timescale in coupled Josephson junction neurons
• Interqubit coupling mediated by a high-excitation-energy quantum object
• Geometrical dependence of low frequency noise in superconducting flux qubits
• Universal quantum gates on microwave photons assisted by circuit quantum electrodynamics
• Fast universal quantum gates on microwave photons with all-resonance operations in circuit QED
• Coherent Control of a Superconducting Qubit with Dynamically Tunable Qubit-cavity Coupling
• Coupling superconducting flux qubits at optimal point via dynamic decoupling with the quantum bus
• Observing pure effects of counter-rotating terms without ultrastrong coupling: A single photon can simultaneously excite two qubits
• Strong tunable coupling between a superconducting charge and phase qubit
• Hamiltonian gadgets with reduced resource requirements
• Tunable inductive coupling of superconducting qubits in the strongly nonlinear regime
• Squeezing as the source of inefficiency in the quantum Otto cycle
• Analysis of a tuneable coupler for superconducting phase qubits
• Quantum Simulation Architecture for Lattice Bosons in Arbitrary, Tunable External Gauge Fields
• Spectroscopy of superconducting charge qubits coupled by a Josephson inductance
• Tunable coupling between three qubits as a building block for a superconducting quantum computer
• Native approach to controlled-Z gates in inductively coupled fluxonium qubits
• Real-time simulation of flux qubits used for quantum annealing
• Parametric four-wave mixing toolbox for superconducting resonators
• Active control of qubit-qubit entanglement evolution
• Steady-state entanglement enhanced by a dissipative ancilla
• Demonstration of long-range correlations via susceptibility measurements in a one-dimensional superconducting Josephson spin chain
• Simulation of Kitaev model using one-dimensional chain of superconducting qubits and environmental effect on topological states
• Infinite-range transverse field Ising models and quantum computation
• On wireless connection between Josephson qubits
• A tunable coupler with ScS quantum point contact to mediate strong interaction between flux qubits
• Optimizing for periodicity: a model-independent approach to flux crosstalk calibration for superconducting circuits
• Control over few photon pulses by a time-periodic modulation of the photon-emitter coupling
• A full-vortex flux qubit for charged particle optics
• Bosonic Entanglement and Quantum Sensing from Energy Transfer in two-tone Floquet Systems
• Optimizing the frequency positioning of tunable couplers in a circuit QED processor to mitigate spectator effects on quantum operations
• The Computational Limit to Quantum Determinism and the Black Hole Information Loss Paradox