Exploring Quantum Resources: Mid‑Circuit Measurements and Non‑Stabilizerness
A talk to be given next week on "magic, muggles, measurement, a meditation on quantum resources in five readings", about computational resources of mid-circuit measurements, non-stabilizerness and other resources in notions of quantum computing. https://t.co/WIU3zwN6fc
Tight Inapproximability Bounds for Max‑LINSAT Impact Quantum Interferometry
Tight inapproximability of max-LINSAT and implications for decoded quantum interferometry https://t.co/RzBXqS1r1k We establish tight inapproximability bounds for max-LINSAT, the problem of maximizing the number of satisfied linear constraints over the finite field 𝔽_q, where each constraint accepts r values...
Clustered‑Cyclic Codes Enable Parallel Quantum Logic
QGPU: Parallel logic in quantum LDPC codes We introduce #clusteredcycliccodes and show how to pursue highly parallelized surface-code style quantum logic with quantum low density parity check codes featuring simple logicals. https://t.co/RMIt29In5N In detail, #quantumerrorcorrection is critical in the design and manufacture of...
Certifying Quantum Magic Proven Super‑Exponential Hard
The unbearable hardness of deciding about magic Identifying the boundary between classical and quantum computation is a central challenge in quantum information. In multi-qubit systems, entanglement and magic are the key resources underlying genuinely quantum behaviour. While entanglement is well understood,...
Classical Outcomes Make Quantum Measurement Learning Exponentially Hard
There are interesting separations in quantum learning theory depending on whether or not one has access to post-measurement states in quantum measurement. https://t.co/9I0Rz30QIq Learning properties of quantum states and channels is known to benefit from resources such as entangled operations, auxiliary qubits,...
Mid‑Circuit Measurements Unlock Quantum Advantage in Shallow Circuits
Mid-circuit measurements are a powerful tool for state preparation, and they have generated considerable excitement in condensed matter physics due to their rich and surprising effects. In contrast, their usefulness for #quantumcomputation remains comparatively less well understood. In this work,...
Three Lower Bounds Achieve Near-Exact Ground-State Energies
Variational #quantumalgorithms and classical variational methods, such as #tensornetwork techniques, provide upper bounds on ground-state energies. However, to meaningfully assess their performance and reliability, these results should be complemented by efficiently computable lower bounds. https://t.co/Fxs5ORiqcW This work demonstrates that three distinct types...
New Methods Certify Photonic Quantum States Amid Indistinguishability
Photons are indistinguishable, and this makes certification - as it is relevant for photonic state preparations and computing - a subtle issue. We introduce methods and a mindset for certification of linear optical quantum state preparation that work in the...
Quantum Software Alliance Launches Site to Accelerate Practical Computing
Quantum software is essential to make quantum technology work. The #QuantumSoftwareAlliance is a network of research institutions focused on making quantum computing practical through software, with an emphasis on co-design, algorithm discovery, verification, benchmarking, and interoperability. The web page is now...
Local Stoquastic Hamiltonians Remain MA-Hard to Solve
Stoquastic Hamiltonians avoid the sign problem in Monte Carlo simulations, so they are often viewed as the easy corner of many-body physics. We show that this intuition fails. https://t.co/zo2Si0xw35 Even under strict physical structure, estimating the ground-state...
Quantum Computing Enters Practical Era with New Breakthroughs
Quantum computers will finally be useful: What's behind the revolution. https://t.co/jfR0QVkWxU An interesting read and good article in @Nature by @dcastelvecchi. https://t.co/iQZYLMQK3Z
Quantum Software Alliance Highlights Software’s Role in Computing
At the rump session of #QIP2026, @ElhamKashefi announced the #QuantumSoftwareAlliance, stressing the importance of research and development of quantum algorithms and software, concomitant with quantum hardware development. A quantum computer needs both hardware and software. This is just a cute...
Efficient Quantum Operations Reshape Entanglement Theory
A wonderful and highly compressed medley on the consequences for quantum information theory when one is limited to computationally efficient steps at #QIP2026, impressively delivered by Lorenzo Leone and Thomas Hahn. If somebody had told me years ago that quantum...
Lorenzo Leone Clarifies Clifford Commutant Research at QIP2026
At #QIP2026, Lorenzo Leone gives a wonderfully clear talk about out work on the Clifford commutant. https://t.co/GAmLOJFMsQ https://t.co/WaBmbW2G63
Quantum Combs Extended to Continuous‑time Field Limit
Formalising an operational continuum limit of quantum combs Quantum combs or quantum process tensors naturally capture multitime processes in quantum mechanics. We bring such combs to the continuum limit, capturing quantum fields. https://t.co/Kof534d3He Concretely, quantum #combs are powerful conceptual tools for capturing multi-time...
Efficient Decoding Redefines Quantum Channel Capacities, Reveals Separation
This is a paper I very much like, for its foundational and somewhat "rebellious" character: We show that notions channel capacities are strongly altered if one simply assumes that all operations one can implement are efficient. https://t.co/WAe4Et1SDy To the point, #quantumchannelcapacities are...
Adam Wills Joins to Explore Quantum Error Correction
What a pleasure to have @adam_wills1 visiting us for this week to discuss notions of #quantumerrorcorrection. https://t.co/07pCKcT4pv
Shadow Tomography of GKP Logical Subsystems via Twirled Measurements
Chasing shadows with Gottesman-Kitaev-Preskill codes https://t.co/n2Ez7A6Ehz We explore a research question at the intersection of #quantumerrorcorrection and #quantumlearningtheory. Concretely, we consider the task of performing shadow tomography of a logical subsystem defined via the Gottesman-Kitaev-Preskill (#GKP) error correcting code. Our protocol does...
Deep Dialogue on Quantum Futures and Science Outreach
It has been a great pleasure—and both fun and insightful—to speak with Thomas Ramge about the future of quantum technologies, broader aspects of science and technology, and what makes science so exciting in the first place. I especially appreciate the...