The Schrodinger cat's Post
@schrodcatpost.bsky.social
Sharing the latest developments in the world of quantum science.
I am not a bot. In the real life, I am Adrien Devolder (@adriendevolder), research associate in quantum control at the University of Toronto.
I am not a bot. In the real life, I am Adrien Devolder (@adriendevolder), research associate in quantum control at the University of Toronto.
That’s it for the daily selection. If you enjoyed it, please consider giving me a like or reposting to support my content. Thanks! (Remember that these papers are published on arXiv before undergoing any peer review.)
December 9, 2025 at 2:14 PM
That’s it for the daily selection. If you enjoyed it, please consider giving me a like or reposting to support my content. Thanks! (Remember that these papers are published on arXiv before undergoing any peer review.)
AlphaQubit 2 is a neural-network decoder that delivers near-optimal logical error rates while decoding in under a microsecond, and works at scale for both surface and colour codes.
arxiv.org/abs/2512.07737
arxiv.org/abs/2512.07737
A scalable and real-time neural decoder for topological quantum codes
Fault-tolerant quantum computing will require error rates far below those achievable with physical qubits. Quantum error correction (QEC) bridges this gap, but depends on decoders being simultaneously...
arxiv.org
December 9, 2025 at 2:14 PM
AlphaQubit 2 is a neural-network decoder that delivers near-optimal logical error rates while decoding in under a microsecond, and works at scale for both surface and colour codes.
arxiv.org/abs/2512.07737
arxiv.org/abs/2512.07737
A new approach achieves time-independent circuit depth for quantum simulation, with small classical overhead. Thanks to partition of the dynamical Lie algebra, unitary synthesis can be done through several low-dimensional optimizations.
arxiv.org/abs/2512.06070
arxiv.org/abs/2512.06070
RedCarD: A Quantum Assisted Algorithm for Fixed-Depth Unitary Synthesis via Cartan Decomposition
A critical step in developing circuits for quantum simulation is to synthesize a desired unitary operator using the circuit building blocks. Studying unitaries and their generators from the Lie algebr...
arxiv.org
December 9, 2025 at 2:14 PM
A new approach achieves time-independent circuit depth for quantum simulation, with small classical overhead. Thanks to partition of the dynamical Lie algebra, unitary synthesis can be done through several low-dimensional optimizations.
arxiv.org/abs/2512.06070
arxiv.org/abs/2512.06070
A new work proposes protecting quantum information from noise by using adaptive weak measurements and carefully chosen postselection bases, which allow accurate signal reconstruction.
arxiv.org/abs/2512.06619
arxiv.org/abs/2512.06619
Fault-Tolerant Information Processing with Quantum Weak Measurement
Noise is an important factor that influences the reliability of information acquisition, transmission, processing, and storage. In order to suppress the inevitable noise effects, a fault-tolerant info...
arxiv.org
December 9, 2025 at 2:14 PM
A new work proposes protecting quantum information from noise by using adaptive weak measurements and carefully chosen postselection bases, which allow accurate signal reconstruction.
arxiv.org/abs/2512.06619
arxiv.org/abs/2512.06619
A new fast, adaptive calibration methods continually retune qubits and gates using measurement feedback, either shot-by-shot or in small batches, even during quantum error correction.
arxiv.org/abs/2512.07815
arxiv.org/abs/2512.07815
Fast-feedback protocols for calibration and drift control in quantum computers
We introduce two classes of lightweight, adaptive calibration protocols for quantum computers that leverage fast feedback. The first enables shot-by-shot updates to device parameters using measurement...
arxiv.org
December 9, 2025 at 2:14 PM
A new fast, adaptive calibration methods continually retune qubits and gates using measurement feedback, either shot-by-shot or in small batches, even during quantum error correction.
arxiv.org/abs/2512.07815
arxiv.org/abs/2512.07815
A new article introduces a new decoder for quantum LDPC codes based on beam search that can be tuned to trade speed for accuracy. Compared to the standard decoder, it achieves significantly lower logical error rates or much faster runtime.
arxiv.org/abs/2512.07057
arxiv.org/abs/2512.07057
Beam search decoder for quantum LDPC codes
We propose a decoder for quantum low density parity check (LDPC) codes based on a beam search heuristic guided by belief propagation (BP). Our beam search decoder applies to all quantum LDPC codes and...
arxiv.org
December 9, 2025 at 2:14 PM
A new article introduces a new decoder for quantum LDPC codes based on beam search that can be tuned to trade speed for accuracy. Compared to the standard decoder, it achieves significantly lower logical error rates or much faster runtime.
arxiv.org/abs/2512.07057
arxiv.org/abs/2512.07057
That’s it for the daily selection. If you enjoyed it, please consider giving me a like or reposting to support my content. Thanks! (Remember that these papers are published on arXiv before undergoing any peer review.)
December 8, 2025 at 4:19 PM
That’s it for the daily selection. If you enjoyed it, please consider giving me a like or reposting to support my content. Thanks! (Remember that these papers are published on arXiv before undergoing any peer review.)
A new article introduces an automated, resource-aware framework for quantum data loading that balances exact and approximate state preparation to minimize quantum resources.
arxiv.org/abs/2512.05183
arxiv.org/abs/2512.05183
Quantum compilation framework for data loading
Efficient encoding of classical data into quantum circuits is a critical challenge that directly impacts the scalability of quantum algorithms. In this work, we present an automated compilation framew...
arxiv.org
December 8, 2025 at 4:19 PM
A new article introduces an automated, resource-aware framework for quantum data loading that balances exact and approximate state preparation to minimize quantum resources.
arxiv.org/abs/2512.05183
arxiv.org/abs/2512.05183
A new continuous-variable quantum optical neural network (QONN) framework combines Gaussian transformations with non-Gaussian photon subtractions to implement nonlinear activations, theoretically satisfying universal approximation.
arxiv.org/abs/2512.05204
arxiv.org/abs/2512.05204
Hardware-inspired Continuous Variables Quantum Optical Neural Networks
Continuous-variables (CV) quantum optics is a natural formalism for neural networks (NNs) due to its ability to reproduce the information processing of such trainable interconnected systems. In quantu...
arxiv.org
December 8, 2025 at 4:19 PM
A new continuous-variable quantum optical neural network (QONN) framework combines Gaussian transformations with non-Gaussian photon subtractions to implement nonlinear activations, theoretically satisfying universal approximation.
arxiv.org/abs/2512.05204
arxiv.org/abs/2512.05204
A new hybrid quantum-classical multifidelity framework uses sparse classical data to correct low-fidelity quantum PDE solutions, enabling high-accuracy predictions despite limited qubits and shallow circuits.
arxiv.org/abs/2512.05241
arxiv.org/abs/2512.05241
Bridging quantum and classical computing for partial differential equations through multifidelity machine learning
Quantum algorithms for partial differential equations (PDEs) face severe practical constraints on near-term hardware: limited qubit counts restrict spatial resolution to coarse grids, while circuit de...
arxiv.org
December 8, 2025 at 4:19 PM
A new hybrid quantum-classical multifidelity framework uses sparse classical data to correct low-fidelity quantum PDE solutions, enabling high-accuracy predictions despite limited qubits and shallow circuits.
arxiv.org/abs/2512.05241
arxiv.org/abs/2512.05241
A new class of error-protected quantum gates, called PUDDING, in solid-state NV centers are robust to both amplitude and frequency errors. These gates achieve significantly lower error rates, 1.2 x 10^{-5}.
arxiv.org/abs/2512.05322
arxiv.org/abs/2512.05322
Highly resilient, error-protected quantum gates in a solid-state quantum network node
High-fidelity quantum gates are a cornerstone of any quantum computing and communications architecture. Realizing such control in the presence of realistic errors at the level required for beyond-thre...
arxiv.org
December 8, 2025 at 4:19 PM
A new class of error-protected quantum gates, called PUDDING, in solid-state NV centers are robust to both amplitude and frequency errors. These gates achieve significantly lower error rates, 1.2 x 10^{-5}.
arxiv.org/abs/2512.05322
arxiv.org/abs/2512.05322
That’s it for the daily selection. If you enjoyed it, please consider giving me a like or reposting to support my content. Thanks! (Remember that these papers are published on arXiv before undergoing any peer review.)
December 2, 2025 at 2:57 PM
That’s it for the daily selection. If you enjoyed it, please consider giving me a like or reposting to support my content. Thanks! (Remember that these papers are published on arXiv before undergoing any peer review.)
This work systematically benchmarks the sample-based quantum diagonalization method for molecular electronic structure using the W4-11 dataset, revealing that while achieving CCSD-level accuracy, performance varies across reaction types and highlights current limitations.
arxiv.org/abs/2512.01012
arxiv.org/abs/2512.01012
From Promise to Practice: Benchmarking Quantum Chemistry on Quantum Hardware
We provide a systematic evaluation of the sample-based quantum diagonalization (SQD) method for electronic structure based on the W4-11 thermochemistry dataset, comprising 124 total atomization, 83 bo...
arxiv.org
December 2, 2025 at 2:57 PM
This work systematically benchmarks the sample-based quantum diagonalization method for molecular electronic structure using the W4-11 dataset, revealing that while achieving CCSD-level accuracy, performance varies across reaction types and highlights current limitations.
arxiv.org/abs/2512.01012
arxiv.org/abs/2512.01012
Variational quantum algorithm can solve a one-dimensional diffusion problem modeling ion transport across multi-layer membranes, as shown in a new paper. Furthermore, the method handles discontinuities and non-trivial boundary conditions.
arxiv.org/abs/2512.01120
arxiv.org/abs/2512.01120
Variational quantum algorithm for anion exchange across electrolyzer membrane
We present a variational quantum algorithm that solves the one-dimensional diffusion problem with a space-dependent diffusion constant $D(x)$. This problem is relevant for the exchange of hydroxide io...
arxiv.org
December 2, 2025 at 2:57 PM
Variational quantum algorithm can solve a one-dimensional diffusion problem modeling ion transport across multi-layer membranes, as shown in a new paper. Furthermore, the method handles discontinuities and non-trivial boundary conditions.
arxiv.org/abs/2512.01120
arxiv.org/abs/2512.01120
A new article presents an unsupervised machine learning method to detect phase transitions and emergent phenomena in quantum many-body experiments directly from limited experimental data.
arxiv.org/abs/2512.01091
arxiv.org/abs/2512.01091
Unsupervised Machine Learning for Experimental Detection of Quantum-Many-Body Phase Transitions
Quantum many-body (QMB) systems are generally computationally hard: the computing resources necessary to simulate them exactly can often exceed the existing computation resources by orders of magnitud...
arxiv.org
December 2, 2025 at 2:57 PM
A new article presents an unsupervised machine learning method to detect phase transitions and emergent phenomena in quantum many-body experiments directly from limited experimental data.
arxiv.org/abs/2512.01091
arxiv.org/abs/2512.01091
A new concatenated continuous-variable error-correcting scheme combines GKP states to suppress small Gaussian displacement errors with an analog Steane code to correct rare large lattice-crossing errors, enabling fault-tolerant CV quantum computation.
arxiv.org/abs/2512.00481
arxiv.org/abs/2512.00481
A Concatenated Dual Displacement Code for Continuous-Variable Quantum Error Correction
The continuous-variable (CV) Gaussian no-go theorem fundamentally limits the suppression of Gaussian displacement errors using only Gaussian gates and states. Prior studies have employed Gottesman-Kit...
arxiv.org
December 2, 2025 at 2:57 PM
A new concatenated continuous-variable error-correcting scheme combines GKP states to suppress small Gaussian displacement errors with an analog Steane code to correct rare large lattice-crossing errors, enabling fault-tolerant CV quantum computation.
arxiv.org/abs/2512.00481
arxiv.org/abs/2512.00481
That’s it for the daily selection. If you enjoyed it, please consider giving me a like or reposting to support my content. Thanks! (Remember that these papers are published on arXiv before undergoing any peer review.)
December 1, 2025 at 2:21 PM
That’s it for the daily selection. If you enjoyed it, please consider giving me a like or reposting to support my content. Thanks! (Remember that these papers are published on arXiv before undergoing any peer review.)
A new method rapidly characterizes and compensates two-qubit gates on quantum hardware, expanding the gate set without extensive fine calibration. This approach significantly improves circuit fidelity.
arxiv.org/abs/2511.21831
arxiv.org/abs/2511.21831
No need to calibrate: characterization and compilation for high-fidelity circuit execution using imperfect gates
We propose and validate on real quantum computing hardware a new method for extended two-qubit gate set design, replacing iterative, fine calibration with fast characterization of a small number of ga...
arxiv.org
December 1, 2025 at 2:21 PM
A new method rapidly characterizes and compensates two-qubit gates on quantum hardware, expanding the gate set without extensive fine calibration. This approach significantly improves circuit fidelity.
arxiv.org/abs/2511.21831
arxiv.org/abs/2511.21831
The authors of a new article use Graph Neural Networks to efficiently estimate the stabilizer Rényi entropy, a measure of nonstabilizerness, from the graph representation of quantum circuits. Their approach generalizes across larger and more complex circuits.
arxiv.org/abs/2511.23224
arxiv.org/abs/2511.23224
Nonstabilizerness Estimation using Graph Neural Networks
This article proposes a Graph Neural Network (GNN) approach to estimate nonstabilizerness in quantum circuits, measured by the stabilizer Rényi entropy (SRE). Nonstabilizerness is a fundamental resour...
arxiv.org
December 1, 2025 at 2:21 PM
The authors of a new article use Graph Neural Networks to efficiently estimate the stabilizer Rényi entropy, a measure of nonstabilizerness, from the graph representation of quantum circuits. Their approach generalizes across larger and more complex circuits.
arxiv.org/abs/2511.23224
arxiv.org/abs/2511.23224
A new articles present a framework for distributed logical quantum computing, where qubits and ancillas are partitioned across multiple cores connected by quantum and classical channels. The approach optimizes inter-core two-qubit gates and magic-state routing.
arxiv.org/abs/2511.21885
arxiv.org/abs/2511.21885
Lattice Surgery Aware Resource Analysis for the Mapping and Scheduling of Quantum Circuits for Scalable Modular Architectures
Quantum computing platforms are evolving to a point where placing high numbers of qubits into a single core comes with certain difficulties such as fidelity, crosstalk, and high power consumption of d...
arxiv.org
December 1, 2025 at 2:21 PM
A new articles present a framework for distributed logical quantum computing, where qubits and ancillas are partitioned across multiple cores connected by quantum and classical channels. The approach optimizes inter-core two-qubit gates and magic-state routing.
arxiv.org/abs/2511.21885
arxiv.org/abs/2511.21885
2D organic–inorganic hybrid perovskite quantum wells can encode quantum information in the polarization of emitted photons via exciton spin dynamics and biexciton correlations.
arxiv.org/abs/2511.22060
arxiv.org/abs/2511.22060
Nonlinear Optical Quantum Communication with a Two-Dimensional Perovskite Light Source
Two-dimensional organic-inorganic hybrid perovskite (2D-OIHP) quantum wells are emerging as promising light sources for quantum communication technologies, owing to their ability to generate polarizat...
arxiv.org
December 1, 2025 at 2:21 PM
2D organic–inorganic hybrid perovskite quantum wells can encode quantum information in the polarization of emitted photons via exciton spin dynamics and biexciton correlations.
arxiv.org/abs/2511.22060
arxiv.org/abs/2511.22060
A new hybrid continuous-variable/discrete-variable method can implement arbitrary non-Gaussian operations by decomposing target Hamiltonians into Fourier components realized via bosonic quantum signal processing.
arxiv.org/abs/2511.22286
arxiv.org/abs/2511.22286
Programmable generation of arbitrary continuous-variable anharmonicities and nonlinear couplings
Harmonic oscillators are promising continuous-variable (CV) quantum resources because their infinite-dimensional Hilbert spaces allow for resource-efficient quantum computing and simulation. To reach ...
arxiv.org
December 1, 2025 at 2:21 PM
A new hybrid continuous-variable/discrete-variable method can implement arbitrary non-Gaussian operations by decomposing target Hamiltonians into Fourier components realized via bosonic quantum signal processing.
arxiv.org/abs/2511.22286
arxiv.org/abs/2511.22286