Abstract
Fault-tolerant photonic quantum computing schemes have suffered low photon-loss thresholds and heavy resource requirements particularly when using single-photon qubits. Recently, several approaches utilizing both discrete and continuous variables of light have been proposed to reach high photon-loss thresholds with relatively low resource requirements. Here we present two schemes that outperform known previous schemes in terms of photon-loss thresholds and resource overheads. The first one is a hybrid scheme that combines discrete-variable (DV) and continuous-variable (CV) states of light. This scheme is nearly ballistic in the sense that passive measurements with hybrid entangled states are sufficient with little feedforwards. The second scheme is based on the parity-based encoding and Bayesian error tracking that enables one to reach a significantly high photon-loss threshold of ~8.5% with moderate resource requirements compared to previous known schemes.
© 2023 The Author(s)
PDF Article | Presentation VideoMore Like This
A. P. Lund, H. Haselgrove, and T. C. Ralph
IFB1 International Conference on Quantum Information (QIM) 2007
Tom Douce, Damian Markham, Elham Kashefi, Peter van Loock, and Giulia Ferrini
F3A.2 Quantum Information and Measurement (QIM) 2019
Ashley Stephens and Kae Nemoto
QTu2E.2 Quantum Electronics and Laser Science Conference (CLEO:FS) 2012