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Bulletin of the American Physical Society

Engineering Signal Integrity in Multi-qubit Devices: Part II

Mehrnoosh Vahidpour, William B. O’Brien, Andrew J. Bestwick, Joel Angeles, Jon Tyler Whyland, Diego Scarabelli, Marius Villiers, Michael J. Curtis, Anthony Polloreno, Michael Selvanayagam, Alexander T. Papageorge, Nicholas C. Rubin, Chad T. Rigetti

Published Mar 13, 2017• 1 citation
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Scalable Industrial Early-Warning System Architecture and Sample-Based Krylov Quantum Diagonalization

Urbas Marek

Technical Annex Scalable Industrial Early-Warning System Architecture and Sample-Based Krylov Quantum Diagonalization (SKQD) Integration. and Technical Documentation: Apparent Faster-than-Light (FTL) Signal Transmission Emulator. Purpose and status. This annex consolidates two research-oriented technical notes. Part I proposes a technically realistic, safety-aware architecture for integrating sample-based Krylov quantum diagonalization (SKQD) into an industrial early-warning platform. Part II documents an educational electronics demonstrator that produces an apparent early-arrival timing effect through local prediction and engineered delay, without transmitting information faster than light.

•Jan 31, 2026•0 citations
Abstract A fast and scalable scheme for multi-qubit resetting in superconducting quantum processors is proposed by exploiting the feasibility of frequency-tunable transmon qubits and transmon-like couplers to engineer a full programmable superconducting erasing head. We demonstrate the emergence of collective effects that lead to a decoherence-free subspace during the erasing process. The presence of such a subspace negatively impacts the device’s performance and has been overlooked in other multi-qubit chips. To circumvent this issue and pave the way to the device’s scalability, we employ tunable frequency couplers to identify a specific set of parameters that enables us to erase even those states within this subspace, ensuring the simultaneous multi-qubit resetting, verified here for the two-qubit case. In contrast, we show that collectivity effects can also emerge as an ingredient to speed up the erasing process. To end, we offer a proposal to build up integrated superconducting processors that can be efficiently connected to erasure heads in a scalable way.
Technical Annex Scalable Industrial Early-Warning System Architecture and Sample-Based Krylov Quantum Diagonalization (SKQD) Integration. and Technical Documentation: Apparent Faster-than-Light (FTL) Signal Transmission Emulator. Purpose and status. This annex consolidates two research-oriented technical notes. Part I proposes a technically realistic, safety-aware architecture for integrating sample-based Krylov quantum diagonalization (SKQD) into an industrial early-warning platform. Part II documents an educational electronics demonstrator that produces an apparent early-arrival timing effect through local prediction and engineered delay, without transmitting information faster than light.