Low-Latency Digital Signal Processing for Feedback and Feedforward in Quantum Computing and Communication
Salathe Y, Kurpiers P, Karg T, Lang C, Andersen CK, Akin A, Krinner S, Wallraff A, Eichler C (2018)
Publication Type: Journal article
Publication year: 2018
Journal
Book Volume: 9
Article Number: 034011
Journal Issue: 3
DOI: 10.1103/PhysRevApplied.9.034011
Abstract
Quantum computing architectures rely on classical electronics for control and readout. Employing classical electronics in a feedback loop with the quantum system allows us to stabilize states, correct errors, and realize specific feedforward-based quantum computing and communication schemes such as deterministic quantum teleportation. These feedback and feedforward operations are required to be fast compared to the coherence time of the quantum system to minimize the probability of errors. We present a field-programmable-gate-array-based digital signal processing system capable of real-time quadrature demodulation, a determination of the qubit state, and a generation of state-dependent feedback trigger signals. The feedback trigger is generated with a latency of 110 ns with respect to the timing of the analog input signal. We characterize the performance of the system for an active qubit initialization protocol based on the dispersive readout of a superconducting qubit and discuss potential applications in feedback and feedforward algorithms.
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Switzerland (CH)How to cite
APA:
Salathe, Y., Kurpiers, P., Karg, T., Lang, C., Andersen, C.K., Akin, A.,... Eichler, C. (2018). Low-Latency Digital Signal Processing for Feedback and Feedforward in Quantum Computing and Communication. Physical Review Applied, 9(3). https://dx.doi.org/10.1103/PhysRevApplied.9.034011
MLA:
Salathe, Yves, et al. "Low-Latency Digital Signal Processing for Feedback and Feedforward in Quantum Computing and Communication." Physical Review Applied 9.3 (2018).
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