We demonstrate diabatic two-qubit gates with Pauli error rates down to 4.3 (2)× 10-3 in as
fast as 18 ns using frequency-tunable superconducting qubits. This is achieved by …

In state-of-the-art quantum computing platforms, including superconducting qubits and
trapped ions, imperfections in the two-qubit entangling gates are the dominant contributions …

For building a scalable quantum processor with superconducting qubits, ZZ interaction is of
great concern because its residual has a crucial impact to two-qubit gate fidelity. Two-qubit …

Fault-tolerant quantum computing relies on the ability to detect and correct errors, which in
quantum error correction codes is typically achieved by projectively measuring multi-qubit …

With the potential of quantum algorithms to solve intractable classical problems, quantum
computing is rapidly evolving, and more algorithms are being developed and optimized …

Protecting quantum information from errors is essential for large-scale quantum
computation. Quantum error correction (QEC) encodes information in entangled states of …

Building a quantum computer is a daunting challenge since it requires good control but also
good isolation from the environment to minimize decoherence. It is therefore important to …

Deriving effective Hamiltonian models plays an essential role in quantum theory, with
particular emphasis in recent years on control and engineering problems. In this work, we …

We introduce spectral quantum tomography, a simple method to extract the eigenvalues of a
noisy few-qubit gate, represented by a trace-preserving superoperator, in a SPAM-resistant …

We report, in a sequence of notes, our work on the Alibaba Cloud Quantum Development
Platform (AC-QDP). AC-QDP provides a set of tools for aiding the development of both …