Noisy intermediate-scale quantum computers
Quantum computers have made extraordinary progress over the past decade, and
significant milestones have been achieved along the path of pursuing universal fault-tolerant …
significant milestones have been achieved along the path of pursuing universal fault-tolerant …
Realization of High-Fidelity CZ and -Free iSWAP Gates with a Tunable Coupler
High-fidelity two-qubit gates at scale are a key requirement to realize the full promise of
quantum computation and simulation. The advent and use of coupler elements to tunably …
quantum computation and simulation. The advent and use of coupler elements to tunably …
High-fidelity, high-scalability two-qubit gate scheme for superconducting qubits
High-quality two-qubit gate operations are crucial for scalable quantum information
processing. Often, the gate fidelity is compromised when the system becomes more …
processing. Often, the gate fidelity is compromised when the system becomes more …
Superconducting circuit companion—an introduction with worked examples
This tutorial aims at giving an introductory treatment of the circuit analysis of
superconducting qubits, ie, two-level systems in superconducting circuits. It also touches …
superconducting qubits, ie, two-level systems in superconducting circuits. It also touches …
Quantum crosstalk analysis for simultaneous gate operations on superconducting qubits
Maintaining or even improving gate performance with growing numbers of parallel
controlled qubits is a vital requirement for fault-tolerant quantum computing. For …
controlled qubits is a vital requirement for fault-tolerant quantum computing. For …
Long-Distance Transmon Coupler with cz-Gate Fidelity above
Tunable coupling of superconducting qubits has been widely studied due to its importance
for isolated gate operations in scalable quantum processor architectures. Here, we …
for isolated gate operations in scalable quantum processor architectures. Here, we …
Implementation of Conditional Phase Gates Based on Tunable Interactions
High fidelity two-qubit gates exhibiting low cross talk are essential building blocks for gate-
based quantum information processing. In superconducting circuits, two-qubit gates are …
based quantum information processing. In superconducting circuits, two-qubit gates are …
Floating tunable coupler for scalable quantum computing architectures
We propose a floating tunable coupler that does not rely on direct qubit-qubit coupling
capacitances to achieve the zero-coupling condition. We show that the polarity of the qubit …
capacitances to achieve the zero-coupling condition. We show that the polarity of the qubit …
Fast logic with slow qubits: microwave-activated controlled-Z gate on low-frequency fluxoniums
We demonstrate a controlled-Z gate between capacitively coupled fluxonium qubits with
transition frequencies 72.3 and 136.3 MHz. The gate is activated by a 61.6-ns-long pulse at …
transition frequencies 72.3 and 136.3 MHz. The gate is activated by a 61.6-ns-long pulse at …
Benchmarking coherent errors in controlled-phase gates due to spectator qubits
A major challenge in operating multiqubit quantum processors is to mitigate multiqubit
coherent errors. For superconducting circuits, besides crosstalk originating from imperfect …
coherent errors. For superconducting circuits, besides crosstalk originating from imperfect …