Switchable next-nearest-neighbor coupling for controlled two-qubit operations

Abstract

In a superconducting quantum processor with nearest neighbor coupling, the dispersive interaction between adjacent qubits can result in an effective next-nearest-neighbor coupling whose strength depends on the state of the intermediary qubit. Here, we theoretically explore the possibility of engineering this next-nearest-neighbor coupling to implement controlled two-qubit operations where the intermediary qubit controls the operation on the next-nearest neighbor pair of qubits. In particular, in a system comprising two types of superconducting qubits with anharmonicities of opposite-sign arranged in an -A-B-A- pattern, where the unwanted static ZZ coupling between adjacent qubits could be heavily suppressed, a switchable coupling between the next-nearest-neighbor qubits can be achieved via the intermediary qubit, the qubit state of which functions as an on/off switch for this coupling. Therefore, depending on the adopted activating scheme, various controlled two-qubit operations such as controlled-iSWAP gate can be realized, potentially enabling circuit depth reductions as to a standard decomposition approach for implementing generic quantum algorithms.

References in corpus (48)

• Quantum Computing in the NISQ era and beyond
• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• Charge insensitive qubit design derived from the Cooper pair box
• Surface codes: Towards practical large-scale quantum computation
• Logic gates at the surface code threshold: Superconducting qubits poised for fault-tolerant quantum computing
• Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
• State preservation by repetitive error detection in a superconducting quantum circuit
• Scalable Quantum Simulation of Molecular Energies
• The Flux Qubit Revisited to Enhance Coherence and Reproducibility
• Qubit architecture with high coherence and fast tunable coupling
• Schrieffer-Wolff transformation for quantum many-body systems
• Simulation of Electronic Structure Hamiltonians Using Quantum Computers
• A tunable coupling scheme for implementing high-fidelity two-qubit gates
• Fidelity of quantum operations
• Demonstrating a Continuous Set of Two-qubit Gates for Near-term Quantum Algorithms
• Characterization of addressability by simultaneous randomized benchmarking
• A universal gate for fixed-frequency qubits via a tunable bus
• Low-decoherence flux qubit
• Quantum Process Tomography of a Universal Entangling Gate Implemented with Josephson Phase Qubits
• Optimal quantum control using randomized benchmarking
• Suppression of Qubit Crosstalk in a Tunable Coupling Superconducting Circuit
• Natural two-qubit gate for quantum computation using the XY interaction
• Quantum logic gates for coupled superconducting phase qubits
• A fast, low-leakage, high-fidelity two-qubit gate for a programmable superconducting quantum computer
• Gradient optimization of analytic controls: the route to high accuracy quantum optimal control
• Quantification and Characterization of Leakage Errors
• Procedures for Converting among Lindblad, Kraus and Matrix Representations of Quantum Dynamical Semigroups
• Three Qubit Randomized Benchmarking
• Entanglement of two superconducting qubits in a waveguide cavity via monochromatic two-photon excitation
• Gate-efficient simulation of molecular eigenstates on a quantum computer
• Adaptive hybrid optimal quantum control for imprecisely characterized systems
• Diabatic gates for frequency-tunable superconducting qubits
• High coherence hybrid superconducting qubit
• Implementation of the XY interaction family with calibration of a single pulse
• Density-matrix simulation of small surface codes under current and projected experimental noise
• Analysis of parametrically driven exchange-type (iSWAP) and two-photon (bSWAP) interactions between superconducting qubits
• High-fidelity CZ gate for resonator-based superconducting quantum computers
• Designing High-Fidelity Single-Shot Three-Qubit Gates: A Machine Learning Approach
• Universal gates for protected superconducting qubits using optimal control
• Resonator/zero-Qubit architecture for superconducting qubits
• A programmable three-qubit superconducting processor with all-to-all connectivity
• Quantum gates and architecture for the quantum simulation of the Fermi-Hubbard model
• Fast microwave-driven three-qubit gates for cavity-coupled superconducting qubits
• Open systems dynamics: Simulating master equations in the computer
• Simple implementation of high fidelity controlled-$i$SWAP gates and quantum circuit exponentiation of non-Hermitian gates
• Adiabatic quantum simulations with driven superconducting qubits
• Machine-learning based three-qubit gate for realization of a Toffoli gate with cQED-based transmon systems
• Implementation of the iFREDKIN gate in scalable superconducting architecture for the quantum simulation of Fermionic systems

Cited by in corpus (11)

• Quantum crosstalk analysis for simultaneous gate operations on superconducting qubits
• Fast multi-qubit gates through simultaneous two-qubit gates
• Suppression of static ZZ interaction in an all-transmon quantum processor
• Accurate methods for the analysis of strong-drive effects in parametric gates
• Tunable coupler to fully decouple and maximally localize superconducting qubits
• Tantalum airbridges for scalable superconducting quantum processors
• Scalable Parameter Design for Superconducting Quantum Circuits with Graph Neural Networks
• Light-Matter interactions in Hofstadter lattice with the next-nearest neighbor couplings
• Kernel-Function Based Quantum Algorithms for Finite Temperature Quantum Simulation
• Implementing High-fidelity Two-Qubit Gates in Superconducting Coupler Architecture with Novel Parameter Regions
• Amplifying Decoherence-Free Many-Body Interactions with Giant Atoms Coupled to Parametric Waveguide