NDLI: Robust readout of bosonic qubits in the dispersive coupling regime

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Robust readout of bosonic qubits in the dispersive coupling regime

Content Provider	Semantic Scholar
Author	Hann, Connor T. Elder, S. Wang, Christopher S. Chou, Kevin Schoelkopf, Robert J. Jiang, L.
Copyright Year	2018
Abstract	High-fidelity qubit measurements play a crucial role in quantum computation, communication, and metrology. In recent experiments, it has been shown that readout fidelity can be improved by performing repeated quantum nondemolition (QND) readouts of a qubit’s state through an ancilla. For a qubit encoded in a two-level system, the fidelity of such schemes is limited by the fact that a single error can destroy the information in the qubit. On the other hand, if a bosonic system is used, this fundamental limit can be overcome by utilizing higher levels such that a single error still leaves states distinguishable. In this work, we present a robust readout scheme which leverages both repeated QND readouts and higher-level encodings to asymptotically suppress the effects of mode relaxation and individual measurement infidelity. We calculate the measurement fidelity in terms of general experimental parameters, provide an information-theoretic description of the scheme, and describe its application to several encodings, including cat and binomial codes.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://rsl.yale.edu/sites/default/files/2018_c_hann_robust_readout_of_bosonic_qubits_in_the_dispersive_coupling_regime.pdf
Alternate Webpage(s)	https://rsl.yale.edu/sites/default/files/2017.c._hann._robust_readout.1712.07785.pdf
Language	English
Access Restriction	Open
Subject Keyword	Ancilla bit Code Computation Dispersive partial differential equation Experiment Information theory Linear programming relaxation Plant Leaves Quantum Cascade Lasers Quantum computing Quantum nondemolition measurement Qubit State (computer science)
Content Type	Text
Resource Type	Article

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