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Daily brief

August 11, 2026.

60 quantum research items collected on 2026-08-11; hardware, control, and industry signals routed.

106 items · Quantum, Chips, Power · All briefs

Quantum

60 quantum research items collected on 2026-08-11; hardware, control, and industry signals routed.

Hardware and Error Correction

Control and Quantum-AI Integration

  • From Barren Plateaus to SPSA Optimization in Variational Quantum Eigensolvers

    The barren plateau (BP) phenomenon poses a fundamental challenge to the trainability of variational quantum eigensolvers (VQEs) by causing exponentially vanishing gradients as the system size increases. While extensive studies have investigated the geometric origins of BP, its impact on the optimization dynamics and complexity of practical algorithms under finite-shot measur...

  • Aicir: A Full-Stack Quantum Circuit Simulator with AscendNPU Support

    Quantum computing is a promising way to study problems that are difficult for classical methods, but current quantum hardware still faces limits in scale, noise, and fidelity. Running quantum algorithms on physical machines can also be costly. Quantum circuit simulators therefore remain important because they let researchers design and test algorithms on classical computers...

  • Memory-, Circuit-, and Ansatz-Efficient VQLS for CFD on Hybrid Quantum-HPC Systems

    Fluid dynamics workloads are dominated by repeated solves of large, structured linear systems, motivating the search for quantum acceleration. The Variational Quantum Linear Solver (VQLS) is a leading near-term candidate, but practical deployment on hybrid quantum--high--performance computing (HPC) systems faces three persistent challenges: (i) the linear-combination-of-unit...

  • QSVM-RQNN: Low-Qubit Recurrent Quantum Similarity Learning for Condition Monitoring and Fault Classification

    In the Noisy Intermediate-Scale Quantum (NISQ) era, limited qubit availability and hardware noise constrain the practical deployment of quantum machine learning (QML). Existing quantum neural network (QNN) and quantum convolutional neural network (QCNN) architectures often require increasing quantum resources as the input dimension grows, limiting scalability on near-term de...

  • Autoregressive Projective Quantum Monte Carlo: From a Hermitian to a Non-Hermitian Perspective

    Accurately determining the ground-state properties of quantum many-body systems remains a central challenge. In this work, we introduce an autoregressive projective quantum Monte Carlo (PQMC) framework that leverages recurrent neural networks (RNNs) to guide the stochastic dynamics. By incorporating autoregressive sampling into PQMC, we demonstrate substantial improvements i...

  • A non-Markovian approach to spin-phonon coherence and the breakdown of the Markovian approximation

    Qubit coherence is an essential figure of merit for quantum information processing applications such as quantum computing, or quantum repeaters. Understanding the coherence properties of the underlying physical qubits that facilitate such applications is therefore are often limited by coupling to lattice phonons, which in turn constrains operation temperature. Here we study...

Commercial and Industry Context

  • Microscopic QED origin of spin entanglement

    We study effective spin interactions arising from quantum electrodynamics (QED) scattering between localized fermionic spins. By integrating out photon and mediator fields, the dynamics reduce to an effective spin Hamiltonian. For two qubits in the nonrelativistic regime, the resulting interaction takes a tensor dipolar form with an asymptotic decay proportional to \(R^{-3}\...

  • Morgan Stanley Launches U.S. Innovation Initiative Supporting Quantum and Strategic Technologies

    <a href="https://thequantuminsider.com/2026/08/11/morgan-stanley-us-innovation-initiative-quantum-ai-technologies/" rel="nofollow" title="Morgan Stanley Launches U.S. Innovation Initiative Supporting Quantum and Strategic Technologies"><img alt="Morgan Stanley" class="webfeedsFeaturedVisual wp-post-image" height="688" src="https://thequantuminsider.com/wp-content/uploads/202...

  • Qunnect and Monarch Quantum Partner to Develop Deployable Quantum Networking Hardware

    <a href="https://thequantuminsider.com/2026/08/11/qunnect-monarch-quantum-deployable-quantum-networking-systems/" rel="nofollow" title="Qunnect and Monarch Quantum Partner to Develop Deployable Quantum Networking Hardware"><img alt="global network visual" class="webfeedsFeaturedVisual wp-post-image" height="691" src="https://thequantuminsider.com/wp-content/uploads/2026/08/2...

  • Utah Launches Quantum Initiative With New Quantum Coordination Council

    <a href="https://thequantuminsider.com/2026/08/10/utah-launches-quantum-initiative/" rel="nofollow" title="Utah Launches Quantum Initiative With New Quantum Coordination Council"><img alt="a large white building with a flag on top of it" class="webfeedsFeaturedVisual wp-post-image" height="1067" src="https://thequantuminsider.com/wp-content/uploads/2026/08/td9-ycjprfs.jpg" s...

Unrouted Items

  • A Quantum Coherence Microscope in the Hubbard Regime

    Quantum coherence underlies collective quantum phenomena and emerging quantum technologies. Quantum gas microscopes have transformed quantum simulation by providing projective snapshots of many-body states with single-atom resolution, but spatially resolved measurements of off-diagonal correlations have remained elusive. Here, using the Talbot effect, we introduce a quantum...

  • The quadratic growth of Krylov spread complexity in the BTZ black hole

    The boundary quantity that captures the growth of black-hole interiors quantified by holographic complexity remains unknown beyond 2d dilaton gravity. We provide a critical analysis of a partition-function construction of Krylov spread complexity for thermofield-double states that provides a dimension-independent boundary reconstruction from semiclassical holographic partiti...

  • Decoupling 2D translation-invariant topological CSS codes

    Two-dimensional translation-invariant topological CSS codes on qubits are known to be locally equivalent, after coarse-graining, to stacks of toric codes. However, existing constructions generally break more translation symmetry than is required to remove anyon-permuting translations, leaving open whether any further obstruction exists. We prove that no such obstruction occu...

  • Learning Clifford-structured quantum unitaries and Hamiltonians

    Learning algorithms for structured quantum unitaries and Hamiltonians have primarily considered classes of processes that are local or sparse in the Pauli basis. We turn our attention to learning $n$-qubit quantum unitaries $U$ and Hamiltonians $H$, given query access to $U$ or the unitary evolution of $H$, that may be dense in the Pauli basis but still admit concise Cliffor...

  • Tensor network methods for non-perturbative dynamics of open quantum systems

    The description of open quantum system dynamics beyond the perturbative treatment (usually associated with Markovian master equations) is a computationally challenging task due to the unfavorable exponential scaling of memory kernels. Developed over recent decades in the context of quantum information and condensed matter, tensor networks provide both a new formalism and a t...

  • An upper bound for the purity of absolutely positive partial transpose states

    A quantum state is called absolutely separable (resp. absolutely positive partial transpose (APPT)) if it remains separable (resp. positive partial transpose (PPT)) under any global unitary transformation. It is known that the set of all absolutely separable states is a subset of the set of all APPT states. Moreover, these two sets are identical for qubit-qudit systems. In t...

  • Quantum Information Flow under String-Diagram Rewriting

    We revisit the notion of ``quantum information flow'' introduced in Bob Coecke's early work and seek to give it an explicit string-diagrammatic formalization. Given a semantics preserving string-diagram rewriting sequence, we first distinguish apparent through-paths, which depend on the current graphical presentation, from genuine through paths, which can be compatibly inher...

  • Autonomous Lindblad Realizability of Nonunitary Linear Dynamics with a Carleman Lattice Boltzmann Application

    Carleman lifting converts nonlinear polynomial dynamics into finite linear systems, but the resulting truncations are generally nonunitary and need not correspond to physical quantum evolution. We prove that a finite linear endpoint admits an autonomous Gorini--Kossakowski--Sudarshan--Lindblad (GKSL) realization on vacuum coherences if and only if it is invertible and power...

  • Security of quantum key distribution with passive basis choice and detection-efficiency mismatch for a realistic satellite setup

    Detection-efficiency mismatch is a common problem in realistic quantum key distribution (QKD) systems. The existing security proofs for the case of the passive basis choice provide a nonzero secret key rate only for a small detection-efficiency mismatch. Unfortunately, in realistic setups, the detection-efficiency mismatch can be significant. Here we present a more precise e...

  • State Diagnostics of Complexity in Open Quantum Systems

    We study the emergence of complexity in finite-size quantum systems as their dynamics transition from closed and coherent evolution to interacting and effectively open behavior. Using a state-based geometric framework, we represent mixed quantum states as probability measures on complex projective Hilbert space. This representation allows us to track how interactions reshape...

  • Spread of Entanglement in Generalized Kicked Ising Chain

    We investigate the dynamics of entanglement in a generalized version of the kicked Ising chain, extending the model from the standard qubit case (local dimension $q=2$) to higher local dimensions ($q > 2$). We identify the existence of ''dual-unitary'' points where the model's space-time duality allows for exact analytical solutions. Our analysis reveals that while a few uni...

  • Collective-dissipation-induced dark and metastable-like states for enhanced quantum battery performance

    We investigate the role of symmetry-protected dark states and metastable-like frozen states in the autonomous charging dynamics of open quantum batteries described by a transverse-field Ising model. By comparing local and collective dissipation over a range of system sizes, temperatures, and magnetic phases, we demonstrate that collective dissipation generates symmetry-prote...

  • An Efficient Explicit Implementation of a Quantum Algorithm with Quantum Advantage for Nonlinear Scalar Conservation Laws

    Quantum algorithms for nonlinear partial differential equations remain challenging because nonlinear dynamics are not directly amenable to unitary quantum simulation. Building on the level-set formulation, we construct a quantum algorithm and provide an explicit gate-level implementation for solving scalar conservation laws. The nonlinear equation is first lifted to a linear...

  • Phase-error estimation for quantum key distribution with leaky receivers

    Practical quantum key distribution (QKD) receivers may leak information about their measurement outcomes and settings to the channel (e.g., through detector backflashes or back-reflected Trojan-horse light) that could compromise the protocol's security. Here we present a simple finite-key security proof based on phase-error estimation for prepare-and-measure QKD in the prese...

  • Characterising the set of deterministic quantum correlations in prepare-and-measure scenarios

    Correlations that do not admit a deterministic explanation are a central feature of quantum theory and a key resource for quantum information processing. Identifying and certifying such correlations, however, remains a fundamental challenge. In this work, we advance on this problem by considering deterministic correlations in the prepare-and-measure scenario consistent with...

  • A Domain-Specific Language for Formulating Hybrid Quantum-Classical Meta-Solver Strategies

    A key challenge when designing hybrid quantum-classical workflows is the identification of quantum candidates, that is, determining for which specific problems quantum advantages could potentially be achieved. When choosing between several candidates, it is crucial to consider the characteristics specific to the problem, as these can fundamentally determine how successful qu...

  • Conditions for implementing projective measurements through continuous monitoring

    Projective measurements are foundational for quantum physics in general and quantum information tasks in particular. However, their direct implementation is often not warranted. Here, we investigate under what conditions continuous monitoring that manifests in quantum jump trajectories realises projective measurements over time. Considering finite-dimensional quantum systems...

  • Time Dilation and center of Mass Normalization in the Page-Wootters Formalism

    In this work, we study the emergence of relativistic effects in a composite quantum clock within the Page-Wootters relational formulation of quantum mechanics. We consider a system with internal and center-of-mass degrees of freedom and analyze the conditioned evolution of the center-of-mass relative to the internal system treated as an internal clock. We show that the inter...

  • Quantum Uncomputation of Clean and Dirty Ancilla Qubits

    Automatic uncomputation aims to provide programming-language-level support to facilitate the correct and safe use of ancilla qubits in quantum computing, but efforts have only been made for clean ancillas, leaving dirty ancillas unexplored. We present a unified formalization of the uncomputation of both clean and dirty ancillas. For the first time, we prove that checking the...

  • Conditional non-Hermitian acceleration of multiphoton atomic transitions

    Continuous monitoring can convert a dissipative channel into a resource for accelerating otherwise slow multiphoton transitions. We consider a three-level atom in a $Λ$ configuration and condition the evolution on the absence of photon emission through an auxiliary monitored decay channel. The resulting no-jump dynamics is governed by a non-Hermitian Rabi-type Hamiltonian. U...

  • Quantum Coordination and Nonlocal Games: Theory and Applications

    Coordination is a fundamental primitive in communication and information theory, in which distributed systems must collectively generate correlated behavior rather than merely exchange messages. In quantum networks, the nature of entanglement, quantum measurements, and nonclassical correlations introduces coordination possibilities unavailable classically. This article revie...

  • Compound beams for direct experimental comparison of quantum operations

    Compound beams composed of simple experimental blocks (detected in simultaneous detection windows) that form specific quantum-correlated structures are suggested for simulating the properties of different quantum operations used for creating highly nonclassical and entangled multi-mode states needed in quantum communication, metrology, and information protocols. Qualitative...

  • Faster Algorithms for Multimarginal Optimal Transport

    We study algorithms for approximating the multimarginal optimal transport (MOT) distance, a generalization of the classic optimal transport distance, between $m$ discrete probability distributions each supported on at most $n$ points. We give a classical algorithm that computes a coupling between these marginals whose expected transportation cost is within an additive $\vare...

  • Genuinely Unextendible Product Bases from Maximum Distance Separable Codes

    The existence of genuinely unextendible product bases (GUPBs), incomplete orthogonal sets of fully product states whose orthogonal complements contain no product vector across any bipartition, has remained an open problem. Here we construct GUPBs for any number $N\geq3$ of parties using classical maximum distance separable (MDS) codes. The MDS property imposes a rigidity on...

  • Quantum sensing composite excitations in an anisotropic ferromagnet via a qubit

    Ordered magnets harbor intrinsically squeezed ground states and magnonic excitations characterized by entanglement between spins and nonclassical magnon number composition. A pathway to detecting the superpositions of noneigenmode magnon number states underlying these nonclassical magnetic ground states has recently been demonstrated by utilizing a qubit coupled to the magno...

  • Probing Non-equilibrium baths: Frequency-Resolved Thermometry and Quantum Heat Current Turnover

    Quantum heat transport for non-equilibrium steady state (NESS) exhibits a characteristic turnover effect, where the heat current reaches a maximum and subsequently declines as system-bath coupling increases. Although numerically exact methods can simulate this non-monotonic behavior, they offer limited information on the thermal state of the heat baths. Here, we introduce a...

  • An accelerator-based source of high-intensity quantum-entangled annihilation gamma photons

    We present the concept and development of a novel accelerator-based source of high-intensity quantum-entangled 511 keV gamma-ray pairs produced through positron-electron annihilation. The source leverages the unique capabilities of the proposed Jefferson Lab positron facility to generate polarized, high-current positron beams with a well-defined time structure. These beams e...

  • Birefringent Biomineral Microcarriers Stabilise Multimodal Nanodiamond Quantum Sensing in Liquids

    Mobile nanodiamond quantum sensors in liquids are limited by Brownian rotation, variable photon collection, and perturbations introduced by optical trapping. Here, we assemble 40-nm nitrogen-vacancy nanodiamonds at the surface of porous, birefringent vaterite microspherulites. This carbonate biomineral provides a polarization-addressable body frame, anisotropic emission redi...

  • QTris: a pedagogical board game to teach Quantum Mechanics

    In this paper we introduce the new version of QTris, a board game designed to teach and learn Quantum Mechanics within the framework of Quantum Information and Computation. The key idea behind the game is that every game sequence simulates a process on a system of qubits. Thus, QTris can be effectively integrated as a pedagogical tool to teach Quantum Mechanics at high-schoo...

  • Geometrical approach and topological electron density in the $p_x + ip_y$ superconductor

    We present an analysis on the geometrical and physical nature of the $p_x + ip_y$ superconductor on the square lattice, with an emphasis on the topological phase transition at half-filling. We develop a local topological marker from specific Dirac points within the Brillouin zone, which is introduced via the addition of two one-dimensional (1D) $\mathbb{Z}$ $(\mathbb{Z}_2$)...

  • High-fidelity controlled-phase gates for distinguishable quantum walkers via extended interactions

    We investigate the implementation of controlled-phase (CP) gates with quantum walks in a dual-rail encoding through the use of interacting particles. While previous proposals have focused on indistinguishable particles (bosons or fermions) to achieve unitary fidelity for plane-wave scattering, practical implementations require finite-size wavepackets and routing through sing...

  • Quantum uncertainty in a macroscopic domain

    We develop a classical model-theoretic representation of partial Boolean algebras and use it to formulate quantum-like uncertainty without abandoning classical propositional logic. Given a surjection from the initial formulæ of a propositional language onto a partial Boolean algebra $(\mathcal V,Π)$, we construct a consistent theory $\mathcal T_g$ whose core---the ordered se...

  • PsiQuantum Appoints Atomico Founder Niklas Zennström to Board of Directors

    <a href="https://thequantuminsider.com/2026/08/11/psiquantum-appoints-atomico-founder-niklas-zennstrom-board-directors/" rel="nofollow" title="PsiQuantum Appoints Atomico Founder Niklas Zennström to Board of Directors"><img alt="Niklas Zennström picture." class="webfeedsFeaturedVisual wp-post-image" height="733" src="https://thequantuminsider.com/wp-content/uploads/2026/08/2...

  • Scientists Reveal Hidden Structure of a Quantum Fluid

    <a href="https://thequantuminsider.com/2026/08/11/scientists-reveal-hidden-structure-of-a-quantum-fluid/" rel="nofollow" title="Scientists Reveal Hidden Structure of a Quantum Fluid"><img alt="" class="webfeedsFeaturedVisual wp-post-image" height="685" src="https://thequantuminsider.com/wp-content/uploads/2026/08/Electons.jpg" style="display: block; margin: auto; margin-bott...

  • Infleqtion Selected by Eaton to Explore Quantum Computing for Power Grid Resilience

    <a href="https://thequantuminsider.com/2026/08/10/infleqtion-eaton-quantum-computing-power-grid-resilience/" rel="nofollow" title="Infleqtion Selected by Eaton to Explore Quantum Computing for Power Grid Resilience"><img alt="Infleqtion logo" class="webfeedsFeaturedVisual wp-post-image" height="686" src="https://thequantuminsider.com/wp-content/uploads/2026/08/2026-08-10_19-...

Chips

46 chip stack items collected on 2026-08-11; memory, packaging, compute, and foundry signals routed.

Compute Accelerators

Memory and Advanced Packaging

  • HBM Becomes Testbed For 3D Assembly Yield

    <p>High-bandwidth memory has become a proving ground for 3D stack testing, DFT, and reliability.</p> <p>The post <a href="https://semiengineering.com/hbm-becomes-testbed-for-3d-assembly-yield/">HBM Becomes Testbed For 3D Assembly Yield</a> appeared first on <a href="https://semiengineering.com">Semiconductor Engineering</a>.</p>

  • AI Chiplet Architectures Redefining Test Insertions

    <p>Heterogeneous integration does not simply increase complexity but redistributes where quality must be assured. </p> <p>The post <a href="https://semiengineering.com/ai-chiplet-architectures-redefining-test-insertions/">AI Chiplet Architectures Redefining Test Insertions</a> appeared first on <a href="https://semiengineering.com">Semiconductor Engineering</a>.</p>

  • Failure Analysis HW Enables System-Level Debug For 3D ICs (Google, TU Delft)

    <p>Researchers from Google and Delft University of Technology published a technical paper titled “Innovative FA Hardware Solution to Enable System-Level Debug of 3D ICs.” Abstract Excerpt: &#8220;This paper presents a novel Failure Analysis (FA) hardware and sample preparation solution that enables System-Level FA on mobile System-on-a-Chip (SoC) PoP devices, where the DRAM...

  • Optimizing Chiplet Placement And Interposer Footprint For 2.5D Systems (A*STAR)

    <p>Researchers from A*STAR published a technical paper titled “FAPlace: Joint Optimization of Chiplet Placement and Interposer Footprint for 2.5D Systems.” Abstract Excerpt: &#8221; We propose FAPlace, a footprint aware mask guided sequential placement framework. FAPlace operates on a sufficiently large canvas, eliminating the circular dependency by allowing the optimal inte...

Custom Silicon and Networking

  • Femtosecond Laser Process Targets Depth-Controlled 4H-SiC Wafer Slicing (Texas A&M, KIMM, UST)

    <p>Researchers from Texas A&#38;M University, KIMM, and UST published a technical paper titled “Self-Focusing Control for Depth-Precise Wafer Slicing of 4H-SiC in Femtosecond Laser Processing.” Abstract Excerpt: &#8220;Femtosecond laser slicing for 4H-SiC wafers offers a non-contact processing approach to produce thin layers with low defects, while strong optical nonlinearit...

Unrouted Items

Power

18 power layer items collected on 2026-08-11; data center load, grid, generation, and cooling signals routed.

Data Center Power Demand

  • Battery storage capacity averaged 70% growth over the last three years

    Utility-scale battery storage capacity in the United States increased significantly during the last three years, with an annual average growth rate of 70%. By the end of 2025, the U.S. power system had operational battery storage capacity of 43.6 gigawatts (GW). During the first six months of 2026, operators added another 8.3 GW of battery storage capacity, reaching nearly 5...

  • New York imports more electricity from Canada after high-voltage transmission line opens

    On July 3, 2026, the New York Independent System Operator (NYISO) imported 52 gigawatthours (GWh) of electricity from Canada, the most traded between the two areas since January 2025. Some of the imported electricity flowed along the new Champlain Hudson Power Express (CHPE) transmission line between Quebec, Canada, and New York City, which officially reached commercial oper...

Grid and Generation

Unrouted Items

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