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Ultracoherent superconducting cavity-based multiqudit platform with error-resilient control
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Ultracoherent superconducting cavity-based multiqudit platform with error-resilient control
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Realizing the promise of quantum computing requires simultaneously increasing Hilbert-space size and coherence times. While qubit-based architectures have long been the dominant paradigm, large local Hilbert spaces enable qudits, which offer more compact circuits and natural representations for quantum simulation in chemistry, condensed matter, and high-energy physics. Superconducting radio-frequency (SRF) cavities are attractive building blocks for qudit-based quantum technologies because of their exceptionally low dissipation and large bosonic Hilbert spaces, but turning them into programmable modules requires extra effort because the nonlinear circuitry required for control and measurement often introduces loss and noise that erode the memory advantage. Here we demonstrate a two-mode SRF cavity module weakly coupled to an ancillary transmon circuit and engineered to suppress controller-induced dissipation and dephasing, achieving single-photon lifetimes of 20.6 ms and 15.6 ms and a dephasing time exceeding 40 ms. Using sideband interactions together with error-resilient protocols incorporating measurement-based correction and post-selection, we prepare Fock states up to $N=20$ with fidelities exceeding 95% and generate two-mode entanglement near the coherence limit, approaching 99.9%. By combining ultracoherent storage with high-fidelity control, this work moves cavity-based hardware beyond memory-only operation and establishes a practical route toward high-dimensional encodings and scalable modular quantum information processing.
Forward citations
Cited by 11 Pith papers
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Qubit Noise Sensing via Induced Photon Loss in a Superconducting Cavity
A cavity-based method converts qubit frequency noise into measurable photon loss, validated with injected noise and yielding an upper bound of 5e3 Hz²/Hz at 508 MHz.
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Neural-Network Inverse Design of SRF Cavities and Transmons for Bosonic Quantum Computation
Two feedforward DNNs map target cavity EM observables and qubit–cavity parameters (g, νq, α) to candidate SRF and transmon geometries that re-simulate to within ~5% and ~2%.
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Neural-Network Inverse Design of SRF Cavities and Transmons for Bosonic Quantum Computation
Two DNN models map target cavity observables and transmon-cavity parameters (g, ν_q, α) to candidate geometries, recovering designs that match targets within ~5% and ~2% upon re-simulation.
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Noise-Directed Adaptive Remapping for Integer Optimization: from qubits to (encoded) qudits
NDAR, a heuristic that turns device noise into a resource, is generalized to integer-domain optimization; qudit-native encodings are argued to be the best fit because their all-zeros attractor is always feasible and t...
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Universal Jaynes-Cummings Control of an Oscillator
Experimental demonstration of universal qudit control on a cavity oscillator via compiled Jaynes-Cummings gates with a transmon ancilla, reaching 96% mean post-selected process fidelity for qutrit gates.
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A direct controlled-phase gate between microwave photons
Demonstrates a direct controlled-phase gate between microwave photons in cavities via Raman-assisted cross-Kerr coupling that leaves the nonlinear mediator unexcited.
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Separating Geometry From Interference in Constrained Quantum Optimization
For product-space constrained quantum optimization, the mixer's absolute amplitude transport reduces to a Hamming-shell Markov chain; a certified success bound then requires a phase-alignment condition that the paper ...
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Noise-Directed Adaptive Remapping for Integer Optimization: from qubits to (encoded) qudits
Extends NDAR to integer domains via gauge transformations, analyzes encoding tradeoffs on Max-k-colorable subgraph, and proposes noise as a new encoding selection criterion.
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Sparse Phase Ansatzes for Resource-Efficient Qudit State Preparation via the SNAP-Displacement Protocol
Sparse phase ansatzes for the SNAP-displacement protocol achieve favorable fidelity versus resource trade-offs for qudit state preparation up to dimension 64 in both ideal and noisy regimes.
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Existence of a robust optimal control process for efficient measurements in a two-qubit system
The authors prove existence of a unitary that maps a two-qubit state to one where a single observable expectation equals the initial concurrence and demonstrate a robust optimal control implementation via numerical si...
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Exact and Fixed-Point Grover Search with Qudits
A hardware-oriented framework implements standard, deterministic, and fixed-point Grover search on homogeneous and heterogeneous qudit registers via explicit oracles, diffusion operators, and phase matching.
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