High-speed low-crosstalk detection of a 171 Yb+ qubit using superconducting nanowire single photon detectors


Journal Article

© 2019, The Author(s). Qubits used in quantum computing suffer from errors, either from the qubit interacting with the environment, or from imperfect quantum logic gates. Effective quantum error correcting codes require a high fidelity readout of ancilla qubits from which the error syndrome can be determined without affecting data qubits. Here, we present a detection scheme for 171Yb+ qubits, where we use superconducting nanowire single photon detectors and utilize photon time-of-arrival statistics to improve the fidelity and speed. Qubit shuttling allows for creating a separate detection region where an ancilla qubit can be measured without disrupting a data qubit. We achieve an average qubit state detection time of 11 μs with a fidelity of 99.931(6). The detection crosstalk error, defined as the probability that the data qubit coherence is lost due to the process of detecting an ancilla qubit, is reduced to ~2 × 10−5 by creating a separation of 370 μm between them.

Full Text

Duke Authors

Cited Authors

  • Crain, S; Cahall, C; Vrijsen, G; Wollman, EE; Shaw, MD; Verma, VB; Nam, SW; Kim, J

Published Date

  • December 1, 2019

Published In

Volume / Issue

  • 2 / 1

Electronic International Standard Serial Number (EISSN)

  • 2399-3650

Digital Object Identifier (DOI)

  • 10.1038/s42005-019-0195-8

Citation Source

  • Scopus