140 citations · 355 across the 9 of their papers we have counts for
9 papers
Measurement-induced state transitions in multi-qubit transmon processors
Baptiste Hoyau, Alexander McDonald, Boris M. Varbanov +2
Dispersive readout of the transmon qubit in circuit QED is known to lose its quantum non-demolition character at small to moderate measurement drive amplitudes. This phenomenon is…
Measurement-induced state transitions across the fluxonium qubit landscape
Alex A. Chapple, Boris M. Varbanov, Alexander McDonald +1
Understanding the mechanisms that limit high-fidelity readout in circuit quantum electrodynamics is essential for its optimization. Multi-photon resonances are understood to be a l…
Reducing the error rate of a superconducting logical qubit using analog readout information
Hany Ali, Jorge Marques, Ophelia Crawford +7
Quantum error correction enables the preservation of logical qubits with a lower logical error rate than the physical error rate, with performance depending on the decoding method.…
Neural network decoder for near-term surface-code experiments
Boris M. Varbanov, Marc Serra-Peralta, David Byfield +1
Neural-network decoders can achieve a lower logical error rate compared to conventional decoders, like minimum-weight perfect matching, when decoding the surface code. Furthermore,…
Microwave-activated gates between a fluxonium and a transmon qubit
Alessandro Ciani, Boris M. Varbanov, Nicolas Jolly +2
We propose and analyze two types of microwave-activated gates between a fluxonium and a transmon qubit, namely a cross-resonance (CR) and a CPHASE gate. The large frequency differe…
Logical-qubit operations in an error-detecting surface code
J. F. Marques, B. M. Varbanov, M. S. Moreira +10
We realize a suite of logical operations on a distance-two logical qubit stabilized using repeated error detection cycles. Logical operations include initialization into arbitrary…
A hardware-efficient leakage-reduction scheme for quantum error correction with superconducting transmon qubits
Francesco Battistel, Boris M. Varbanov, Barbara M. Terhal
Leakage outside of the qubit computational subspace poses a threatening challenge to quantum error correction (QEC). We propose a scheme using two leakage-reduction units (LRUs) th…
Leakage detection for a transmon-based surface code
B. M. Varbanov, F. Battistel, B. M. Tarasinski +4
Leakage outside of the qubit computational subspace, present in many leading experimental platforms, constitutes a threatening error for quantum error correction (QEC) for qubits.…
Protecting quantum entanglement from leakage and qubit errors via repetitive parity measurements
C. C. Bultink, T. E. O'Brien, R. Vollmer +9
Protecting quantum information from errors is essential for large-scale quantum computation. Quantum error correction (QEC) encodes information in entangled states of many qubits,…