Chalmers Researchers Accelerate Bosonic Quantum Operations by 1,000x Using Quantum Lattice Gates
Researchers at Chalmers University of Technology have developed a new method using Quantum Lattice Gates (QLGs) that accelerates bosonic quantum operations by up to 1,000 times. This breakthrough allows for faster and more robust quantum error correction by completing complex quantum operations within a single Floquet driving period, rather than thousands of repeated cycles, making it compatible with existing superconducting quantum circuits. The technique has achieved high-fidelity state preparation and logical gate operations, scaling linearly with Hilbert-space dimension.
Physicists at Chalmers University of Technology have developed a theoretical and computational method that executes complex continuous-variable (CV) quantum operations on bosonic codes up to 1,000 times faster than existing adiabatic techniques. Published in Physical Review Letters (DOI: 10.1103/tnb8-3m8m), the breakthrough addresses a major bottleneck in quantum error correction (QEC) by completing state synthesis and logical gate operations within a single Floquet driving period rather than thousands of repeated cycles.
Instead of encoding information in individual physical transmons, bosonic quantum codes store qubits within the continuous-variable microwave fields of superconducting resonators, offering built-in protection against decoherence. However, controlling continuous-variable states traditionally requires slow adiabatic ramps that expose fragile quantum states to environmental noise. By employing Quantum Lattice Gates (QLGs)—which utilize the non-perturbative non-linearity of Josephson junctions alongside Noncommutative Fourier Transformations (NcFT)—the Chalmers team synthesized arbitrary unitaries directly from the vacuum state in a single period, effectively eliminating the need for multi-period adiabatic driving.
[ Single-Period Floquet Control Performance Metrics ] | ||
Target Bosonic Code | Preparation & Gate Fidelities | Operational Advantages |
• Gottesman-Kitaev-Preskill (GKP) | • State Infidelity: < 10-3 (from vacuum) | • Execution Time: 1 Floquet Period (∼1000× faster) |
• Binomial & 4-Component Cat Codes | • Logical Gate Errors ({h, s, t}): ∼ 10-3 | • Hardware: Compatible with Existing Superconducting Circuits |
• Haar-Random State Sampling | • Linear Hilbert Space Scaling O(D) | • Noise Robustness: 3 Orders of Magnitude Higher than AR |
When combined with Optimal Pulse Engineering (OPE), the single-period Floquet method demonstrated high-fidelity state preparation for Binomial, Cat, and GKP codewords from the vacuum state with infidelities below 10-3. Furthermore, universal single-qubit logical gate sets—including Hadamard (h), Phase (s), and π/8 (t) gates—achieved average gate errors on the order of 10-3 within microsecond execution windows. The technique scales linearly with Hilbert-space dimension D, providing a hardware-compatible blueprint for the 100-qubit superconducting quantum processor currently under construction at the Wallenberg Centre for Quantum Technology (WACQT).
Review the university announcement on EurekAlert! here, access the peer-reviewed research paper in Physical Review Letters here, and examine hardware research initiatives at the Wallenberg Centre for Quantum Technology (WACQT) here.
September 10, 2026
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