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 (https://www.linkedin.com/in/adrien-devolder-692b7a146/), research associate in quantum control at the University of Toronto.
I am not a bot. In the real life, I am Adrien Devolder (https://www.linkedin.com/in/adrien-devolder-692b7a146/), research associate in quantum control at the University of Toronto.
Pinned
Happy New Year! All the best in 2026!
In 2026, the Schrödinger Cat Post will keep you informed on major advances in quantum science by curating the most important papers from the hundreds published each week on arXiv.
In 2026, the Schrödinger Cat Post will keep you informed on major advances in quantum science by curating the most important papers from the hundreds published each week on arXiv.
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.)
January 16, 2026 at 2:08 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.)
While neural-network decoders like AlphaQubit are very accurate, they are too slow. By using a recurrent transformer-based neural network and a different training strategy, a new model achieves state-of-the-art accuracy while meeting microsecond latency requirements.
arxiv.org/abs/2601.09921
arxiv.org/abs/2601.09921
Learning to Decode in Parallel: Self-Coordinating Neural Network for Real-Time Quantum Error Correction
Fast, reliable decoders are pivotal components for enabling fault-tolerant quantum computation (FTQC). Neural network decoders like AlphaQubit have demonstrated potential, achieving higher accuracy th...
arxiv.org
January 16, 2026 at 2:08 PM
While neural-network decoders like AlphaQubit are very accurate, they are too slow. By using a recurrent transformer-based neural network and a different training strategy, a new model achieves state-of-the-art accuracy while meeting microsecond latency requirements.
arxiv.org/abs/2601.09921
arxiv.org/abs/2601.09921
A new paper argues that the best path toward fault-tolerant quantum computing is to combine different qubit technologies into one heterogeneous system. Specifically, combining superconducting and neutral atom qubit can significantly improve the performance.
arxiv.org/abs/2601.10144
arxiv.org/abs/2601.10144
Bridging Superconducting and Neutral-Atom Platforms for Efficient Fault-Tolerant Quantum Architectures
The transition to the fault-tolerant era exposes the limitations of homogeneous quantum systems, where no single qubit modality simultaneously offers optimal operation speed, connectivity, and scalabi...
arxiv.org
January 16, 2026 at 2:08 PM
A new paper argues that the best path toward fault-tolerant quantum computing is to combine different qubit technologies into one heterogeneous system. Specifically, combining superconducting and neutral atom qubit can significantly improve the performance.
arxiv.org/abs/2601.10144
arxiv.org/abs/2601.10144
A new work studies how well quantum error correcting (QEC) codes actually protect quantum states when the noise comes from a realistic physical environment, not from idealized error channels. The authors embed QEC codes directly into microscopic system-bath models.
arxiv.org/abs/2601.10206
arxiv.org/abs/2601.10206
Noise-Resilient Quantum Evolution in Open Systems through Error-Correcting Frameworks
We analyze quantum state preservation in open quantum systems using quantum error-correcting (QEC) codes that are explicitly embedded into microscopic system-bath models. Instead of abstract quantum c...
arxiv.org
January 16, 2026 at 2:08 PM
A new work studies how well quantum error correcting (QEC) codes actually protect quantum states when the noise comes from a realistic physical environment, not from idealized error channels. The authors embed QEC codes directly into microscopic system-bath models.
arxiv.org/abs/2601.10206
arxiv.org/abs/2601.10206
SpinPulse is an open-source Python simulator designed to model spin-qubit quantum computers at the pulse level. It realistically captures spin-qubit physics and non-Markovian noise.
@cramosmarimon.bsky.social
arxiv.org/abs/2601.10435
@cramosmarimon.bsky.social
arxiv.org/abs/2601.10435
The SpinPulse library for transpilation and noise-accurate simulation of spin qubit quantum computers
We introduce SpinPulse, an open-source python package for simulating spin qubit-based quantum computers at the pulse-level. SpinPulse models the specific physics of spin qubits, particularly through t...
arxiv.org
January 16, 2026 at 2:08 PM
SpinPulse is an open-source Python simulator designed to model spin-qubit quantum computers at the pulse level. It realistically captures spin-qubit physics and non-Markovian noise.
@cramosmarimon.bsky.social
arxiv.org/abs/2601.10435
@cramosmarimon.bsky.social
arxiv.org/abs/2601.10435
A new paper shows how to optimize neutral-atom qubit readout by balancing measurement fidelity and atom survival, introducing Quantum Circuit Iteration Rate (qCIR) as a practical new metric.
arxiv.org/abs/2601.10492
arxiv.org/abs/2601.10492
Optimized readout strategies for neutral atom quantum processors
Neutral atom quantum processors have emerged as a promising platform for scalable quantum information processing, offering high-fidelity operations and exceptional qubit scalability. A key challenge i...
arxiv.org
January 16, 2026 at 2:08 PM
A new paper shows how to optimize neutral-atom qubit readout by balancing measurement fidelity and atom survival, introducing Quantum Circuit Iteration Rate (qCIR) as a practical new metric.
arxiv.org/abs/2601.10492
arxiv.org/abs/2601.10492
Modern LLMs, when organized into multi-agent systems, can autonomously perform advanced tensor network simulations with about 90% success rate.
arxiv.org/abs/2601.10194
arxiv.org/abs/2601.10194
Autonomous Quantum Simulation through Large Language Model Agents
We demonstrate that large language model (LLM) agents can autonomously perform tensor network simulations of quantum many-body systems, achieving approximately 90% success rate across representative b...
arxiv.org
January 16, 2026 at 2:08 PM
Modern LLMs, when organized into multi-agent systems, can autonomously perform advanced tensor network simulations with about 90% success rate.
arxiv.org/abs/2601.10194
arxiv.org/abs/2601.10194
#Quantum article selection of today:
- Quantum simulation by LLM agents
- Optimized readout strategy
- Python library for spin-qubits computers
- Analysis of QEC with quantum open system dynamics
- Heterogeneous quantum architecture
- Neural QEC decoder
More details and links below:
- Quantum simulation by LLM agents
- Optimized readout strategy
- Python library for spin-qubits computers
- Analysis of QEC with quantum open system dynamics
- Heterogeneous quantum architecture
- Neural QEC decoder
More details and links below:
January 16, 2026 at 2:08 PM
#Quantum article selection of today:
- Quantum simulation by LLM agents
- Optimized readout strategy
- Python library for spin-qubits computers
- Analysis of QEC with quantum open system dynamics
- Heterogeneous quantum architecture
- Neural QEC decoder
More details and links below:
- Quantum simulation by LLM agents
- Optimized readout strategy
- Python library for spin-qubits computers
- Analysis of QEC with quantum open system dynamics
- Heterogeneous quantum architecture
- Neural QEC decoder
More details and links below:
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.)
January 15, 2026 at 2:00 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 paper demonstrates the largest optical squeezed state to data by mixing low-photon-number Fock states and heralding via homodyne detection, providing a crucial resource for scalable and fault-tolerant photonic quantum computing.
arxiv.org/abs/2601.09672
arxiv.org/abs/2601.09672
Generation of Large Coherent-State Superpositions in Free-Space Optical Pulses
The generation of non-Gaussian quantum states is a key requirement for universal continuous-variable quantum information processing. We report the experimental generation of large-amplitude squeezed c...
arxiv.org
January 15, 2026 at 2:00 PM
A new paper demonstrates the largest optical squeezed state to data by mixing low-photon-number Fock states and heralding via homodyne detection, providing a crucial resource for scalable and fault-tolerant photonic quantum computing.
arxiv.org/abs/2601.09672
arxiv.org/abs/2601.09672
A new work presents a more efficient method for preparing sparse quantum states by optimizing the isometry that maps a small dense register to the full system. The resulting Toffoli cost scales nearly linearly with the sparsity s.
arxiv.org/abs/2601.09388
arxiv.org/abs/2601.09388
Sparse quantum state preparation with improved Toffoli cost
The preparation of quantum states is one of the most fundamental tasks in quantum computing, and a key primitive in many quantum algorithms. Of particular interest to areas such as quantum simulation ...
arxiv.org
January 15, 2026 at 2:00 PM
A new work presents a more efficient method for preparing sparse quantum states by optimizing the isometry that maps a small dense register to the full system. The resulting Toffoli cost scales nearly linearly with the sparsity s.
arxiv.org/abs/2601.09388
arxiv.org/abs/2601.09388
Network-Based Quantum Computation is a new architecture where logical qubits move through a network of many small fault-tolerant nodes to enable scalable distributed quantum computing.
arxiv.org/abs/2601.09374
arxiv.org/abs/2601.09374
Network-Based Quantum Computing: an efficient design framework for many-small-node distributed fault-tolerant quantum computing
In fault-tolerant quantum computing, a large number of physical qubits are required to construct a single logical qubit, and a single quantum node may be able to hold only a small number of logical qu...
arxiv.org
January 15, 2026 at 2:00 PM
Network-Based Quantum Computation is a new architecture where logical qubits move through a network of many small fault-tolerant nodes to enable scalable distributed quantum computing.
arxiv.org/abs/2601.09374
arxiv.org/abs/2601.09374
A new article show how random fluctuations in the phase of control signals reduce the fidelity of quantum operations. The authors simulate realistic phase noise and show how it directly distorts the qubit evolution during control pulses.
arxiv.org/abs/2601.09014
arxiv.org/abs/2601.09014
Impact of control signal phase noise on qubit fidelity
As qubit decoherence times are increased and readout technologies are improved, nonidealities in the drive signals, such as phase noise, are going to represent a growing limitation to the fidelity ach...
arxiv.org
January 15, 2026 at 2:00 PM
A new article show how random fluctuations in the phase of control signals reduce the fidelity of quantum operations. The authors simulate realistic phase noise and show how it directly distorts the qubit evolution during control pulses.
arxiv.org/abs/2601.09014
arxiv.org/abs/2601.09014
Quantum sensing is moving out of the lab. A scalable, chip-based quantum magnetometer using silicon carbide defect has been manufactured and integrated with on-chip photonics. The device achieves much higher magnetic sensitivity than traditional approaches.
arxiv.org/abs/2601.08945
arxiv.org/abs/2601.08945
Demonstration Of A Quantum Magnetometer Chip Based On Proprietary And Scalable 4H-Silicon Carbide Technology
This work presents an industrially scalable, power-efficient and high-performance quantum magnetometer chip based on proprietary 4H-silicon carbide (SiC) technology, leveraging wafer-scale fabrication...
arxiv.org
January 15, 2026 at 2:00 PM
Quantum sensing is moving out of the lab. A scalable, chip-based quantum magnetometer using silicon carbide defect has been manufactured and integrated with on-chip photonics. The device achieves much higher magnetic sensitivity than traditional approaches.
arxiv.org/abs/2601.08945
arxiv.org/abs/2601.08945
#Quantum article selection of today:
- Scalable quantum magnetometer
- Generation of large optical squeezed cat states
- Impact of laser noise
- Distributed fault-tolerant quantum computing
- Sparse quantum state preparation
More details and links below:
- Scalable quantum magnetometer
- Generation of large optical squeezed cat states
- Impact of laser noise
- Distributed fault-tolerant quantum computing
- Sparse quantum state preparation
More details and links below:
January 15, 2026 at 2:00 PM
#Quantum article selection of today:
- Scalable quantum magnetometer
- Generation of large optical squeezed cat states
- Impact of laser noise
- Distributed fault-tolerant quantum computing
- Sparse quantum state preparation
More details and links below:
- Scalable quantum magnetometer
- Generation of large optical squeezed cat states
- Impact of laser noise
- Distributed fault-tolerant quantum computing
- Sparse quantum state preparation
More details and links below:
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.)
January 14, 2026 at 7:30 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 presents a data-driven method to characterize quantum gates by learning their full open-system dynamics, including non-Markovian noise.
@mohansarovar.bsky.social
arxiv.org/abs/2601.07934
@mohansarovar.bsky.social
arxiv.org/abs/2601.07934
Data-driven learning of non-Markovian quantum dynamics
Fault-tolerant quantum computing requires extremely precise knowledge and control of qubit dynamics during the application of a gate. We develop a data-driven learning protocol for characterizing quan...
arxiv.org
January 14, 2026 at 7:30 PM
A new article presents a data-driven method to characterize quantum gates by learning their full open-system dynamics, including non-Markovian noise.
@mohansarovar.bsky.social
arxiv.org/abs/2601.07934
@mohansarovar.bsky.social
arxiv.org/abs/2601.07934
A new paper evaluates the near- and mid-term potential of quantum optimization and machine learning for industry by combining hardware roadmap analysis with standardized, use-case-driven assessments.
arxiv.org/abs/2601.08578
arxiv.org/abs/2601.08578
Quantum Computing -- Strategic Recommendations for the Industry
This whitepaper surveys the current landscape and short- to mid-term prospects for quantum-enabled optimization and machine learning use cases in industrial settings. Grounded in the QCHALLenge progra...
arxiv.org
January 14, 2026 at 7:30 PM
A new paper evaluates the near- and mid-term potential of quantum optimization and machine learning for industry by combining hardware roadmap analysis with standardized, use-case-driven assessments.
arxiv.org/abs/2601.08578
arxiv.org/abs/2601.08578
MultiQ is a compiler–controller–checker system which enables multiple independent quantum circuits to run simultaneously on a neutral atom quantum processor.
It achieves up to 12x throughput increase.
arxiv.org/abs/2601.08504
It achieves up to 12x throughput increase.
arxiv.org/abs/2601.08504
MultiQ: Multi-Programming Neutral Atom Quantum Architectures
Neutral atom Quantum Processing Units (QPUs) are emerging as a popular quantum computing technology due to their large qubit counts and flexible connectivity. However, performance challenges arise as ...
arxiv.org
January 14, 2026 at 7:30 PM
MultiQ is a compiler–controller–checker system which enables multiple independent quantum circuits to run simultaneously on a neutral atom quantum processor.
It achieves up to 12x throughput increase.
arxiv.org/abs/2601.08504
It achieves up to 12x throughput increase.
arxiv.org/abs/2601.08504
A new tutorial aims at helping understand and implement reinforcement learning in quantum control. The approach brings the gap between theory and practice through clear explanation and hands-on examples.
arxiv.org/abs/2601.08662
arxiv.org/abs/2601.08662
From Classical to Quantum Reinforcement Learning and Its Applications in Quantum Control: A Beginner's Tutorial
This tutorial is designed to make reinforcement learning (RL) more accessible to undergraduate students by offering clear, example-driven explanations. It focuses on bridging the gap between RL theory...
arxiv.org
January 14, 2026 at 7:30 PM
A new tutorial aims at helping understand and implement reinforcement learning in quantum control. The approach brings the gap between theory and practice through clear explanation and hands-on examples.
arxiv.org/abs/2601.08662
arxiv.org/abs/2601.08662
By enforcing quantum orthogonality constraints only where necessary, a new paper show that a quantum LDPC codes with large girth can be constructed. The test on the depolarization channel shows a error rate as low as 10^{-8}.
arxiv.org/abs/2601.08824
arxiv.org/abs/2601.08824
Breaking the Orthogonality Barrier in Quantum LDPC Codes
Classical low-density parity-check (LDPC) codes are a widely deployed and well-established technology, forming the backbone of modern communication and storage systems. It is well known that, in this ...
arxiv.org
January 14, 2026 at 7:30 PM
By enforcing quantum orthogonality constraints only where necessary, a new paper show that a quantum LDPC codes with large girth can be constructed. The test on the depolarization channel shows a error rate as low as 10^{-8}.
arxiv.org/abs/2601.08824
arxiv.org/abs/2601.08824
#Quantum article selection of today:
- Improved qLDPC code
- Tutorial on use of reinforcement learning in quantum control
- Multi-programming neutral atom architecture
- Perspective on quantum optimization and machine learning
- Learning non-Markovian quantum dynamics
More details and links below:
- Improved qLDPC code
- Tutorial on use of reinforcement learning in quantum control
- Multi-programming neutral atom architecture
- Perspective on quantum optimization and machine learning
- Learning non-Markovian quantum dynamics
More details and links below:
January 14, 2026 at 7:30 PM
#Quantum article selection of today:
- Improved qLDPC code
- Tutorial on use of reinforcement learning in quantum control
- Multi-programming neutral atom architecture
- Perspective on quantum optimization and machine learning
- Learning non-Markovian quantum dynamics
More details and links below:
- Improved qLDPC code
- Tutorial on use of reinforcement learning in quantum control
- Multi-programming neutral atom architecture
- Perspective on quantum optimization and machine learning
- Learning non-Markovian quantum dynamics
More details and links below:
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.)
January 13, 2026 at 2:42 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 paper presents a fully secure Coherent One-Way Quantum Key Distribution (COW-QKD) protocol that resists coherent and source side-channel attacjs, achieving secure key distribution over up to 100 km of optical fiber.
arxiv.org/abs/2601.06772
arxiv.org/abs/2601.06772
Experimental Coherent One-Way Quantum Key Distribution with Simplicity and Practical Security
Coherent one-way quantum key distribution (COW-QKD) has been widely investigated, and even been deployed in real-world quantum network. However, the proposal of the zero-error attack has critically un...
arxiv.org
January 13, 2026 at 2:42 PM
A new paper presents a fully secure Coherent One-Way Quantum Key Distribution (COW-QKD) protocol that resists coherent and source side-channel attacjs, achieving secure key distribution over up to 100 km of optical fiber.
arxiv.org/abs/2601.06772
arxiv.org/abs/2601.06772
Emission-based quantum network can efficiently support fault-tolerant modular quantum computing by directly generating multi-qubit GHZ states in a single shot. This significantly improve fault-tolerance threshold for distributed surface codes.
arxiv.org/abs/2601.07241
arxiv.org/abs/2601.07241
Fault-tolerant modular quantum computing with surface codes using single-shot emission-based hardware
Fault-tolerant modular quantum computing requires stabilizer measurements across the modules in a quantum network. For this, entangled states of high quality and rate must be distributed. Currently, t...
arxiv.org
January 13, 2026 at 2:42 PM
Emission-based quantum network can efficiently support fault-tolerant modular quantum computing by directly generating multi-qubit GHZ states in a single shot. This significantly improve fault-tolerance threshold for distributed surface codes.
arxiv.org/abs/2601.07241
arxiv.org/abs/2601.07241