Logical-qubit operations in an error-detecting surface code
| Autor: | Alessandro Bruno, Leonardo DiCarlo, B. Varbanov, Marc Beekman, Nandini Muthusubramanian, Miguel S Moreira, Francesco Battistel, Jorge Marques, Nadia Haider, Wouter Vlothuizen, Barbara M. Terhal, Christos Zachariadis, Hany Ali |
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| Rok vydání: | 2021 |
| Předmět: |
Superconductivity
Bloch sphere Quantum Physics Computer science Condensed Matter - Superconductivity Initialization FOS: Physical sciences General Physics and Astronomy Universal set 01 natural sciences 010305 fluids & plasmas Superconductivity (cond-mat.supr-con) symbols.namesake Pauli exclusion principle Quantum error correction Qubit Logic gate 0103 physical sciences symbols Code (cryptography) ddc:530 Error detection and correction Quantum Physics (quant-ph) 010306 general physics Algorithm |
| Zdroj: | Nature physics 18(1), 80-86 (2022). doi:10.1038/s41567-021-01423-9 |
| ISSN: | 1745-2481 1745-2473 |
| Popis: | We realize a suite of logical operations on a distance-two logical qubit stabilized using repeated error detection cycles. Logical operations include initialization into arbitrary states, measurement in the cardinal bases of the Bloch sphere, and a universal set of single-qubit gates. For each type of operation, we observe higher performance for fault-tolerant variants over non-fault-tolerant variants, and quantify the difference through detailed characterization. In particular, we demonstrate process tomography of logical gates, using the notion of a logical Pauli transfer matrix. This integration of high-fidelity logical operations with a scalable scheme for repeated stabilization is a milestone on the road to quantum error correction with higher-distance superconducting surface codes. Comment: 16 pages, 9 figures, 2 tables |
| Databáze: | OpenAIRE |
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