Visa Vesterinen

Detecting bit-flip errors in a logical qubit using stabilizer measurements

2015 · Nature Communications

Quantum data are susceptible to decoherence induced by the environment and to errors in the hardware processing it. A future fault-tolerant quantum computer will use quantum error correction to actively protect against both. In the …

Qubit Measurement by Multichannel Driving

2018 · arXiv (Cornell University)

We theoretically propose and experimentally implement a method of measuring a qubit by driving it close to the frequency of a dispersively coupled bosonic mode. The separation of the bosonic states corresponding to different qubit …

Broadband continuous variable entanglement generation using Kerr-free Josephson metamaterial

2021 · arXiv (Cornell University)

Entangled microwave photons form a fundamental resource for quantum information processing and sensing with continuous variables. We use a low-loss Josephson metamaterial comprising superconducting, non-linear, asymmetric inductive elements to generate frequency-entangled photons from vacuum fluctuations …

Single-shot readout of a superconducting qubit using a thermal detector

2024 · Nature Electronics

Abstract Measuring the state of a qubit is a key fundamental operation of a quantum computer. High-fidelity single-shot readout of superconducting qubits can be achieved using parametric amplifiers at millikelvin temperatures. However, scaling parametric amplifiers …