QECOOL: On-Line Quantum Error Correction with a Superconducting Decoder for Surface Code
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DescriptionA power-efficient quantum error correction (QEC) in cryogenic environments dramatically improves the scalability of quantum computers with superconducting qubits.
In this paper, we propose an online-QEC algorithm and its hardware implementation with SFQ-based superconducting digital circuits.
We design a key building block of the proposed hardware with an SFQ and evaluate it by a SPICE-level simulator.
Each logic element is composed of about 3000 Josephson junctions and power consumption is about 2.78 uW when operating with 2~GHz clock frequency which meets the required decoding speed.
Our decoder is simulated on a quantum error simulator and achieves a 1.0% accuracy threshold.