Generalized figure of merit for qubit readout
نویسندگان
چکیده
Many promising approaches to fault-tolerant quantum computation require repeated nondemolition (QND) readout of binary observables such as bits (qubits). A commonly used figure merit for performance is the error rate assignment in a single repetition. However, it known that this insufficient. Indeed, real-world outcomes are typically analog instead binary. Binary therefore discards important information on level confidence outcomes. Here, generalized fully captures contained suggested. This Chernoff associated with statistics one Unlike single-repetition rate, uniquely determines asymptotic cumulative arbitrary noise. As result, non-Gaussian noise common experiments can be described by effective Gaussian same information. Importantly, shown universal description persists small number repetitions and non-QND imperfections relevant real experiments. Finally, rigorously quantify amount discarded analog-to-binary conversion. These results provide unified framework qubit should facilitate optimization engineering near-term devices across all platforms.
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ژورنال
عنوان ژورنال: Physical Review A
سال: 2021
ISSN: ['1538-4446', '1050-2947', '1094-1622']
DOI: https://doi.org/10.1103/physreva.103.042404