The Future of Quantum Computing

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University of Connecticut Perturbative Theory Predicts Plateau Height & Timescale
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University of Connecticut Perturbative Theory Predicts Plateau Height & Timescale

A perturbative theory developed by C. L. Sriram and Lea F. Santos at the University of Connecticut, and Soumya Kanti Pal at the Tata Institute of Fundamental Research, now provides analytical expressions for both the height and timescale of how long it takes for strongly interacting quantum systems to approach equilibrium, a calculation previously beyond reach. Researchers found that nearly conserved quantities fragment the system’s quantum behavior, leading to a two-stage equilibration process with long-lived prethermal plateaus. Unlike conventional eigenstate thermalization hypothesis, the team’s fragmented eigenstate thermalization hypothesis (fETH) obeys a symmetry-imposed selection rule that restricts which system sizes can be compared. This band-resolved description also explains ensemble inequivalence without invoking equilibrium phase transitions, offering a new perspective on statistical mechanics for systems exhibiting Hilbert-space fragmentation. Long-Range Interactions and Hilbert Space Fragmentation The structure of quantum chaos is being clarified by discoveries revealing how long-range interactions fundamentally alter the path to thermal equilibrium. Research led by C. L. Sriram at the University of Connecticut, in collaboration with Soumya Kanti Pal of the Tata Institute of Fundamental Research and Lea F. Santos at the University of Connecticut, demonstrates that systems exhibiting strong, long-range interactions do not simply scramble towards disorder as previously understood, but instead navigate a fragmented quantum landscape. The team’s work, dated July 16, 2026, details how these interactions split the system’s quantum states into distinct energy bands, dramatically slowing the approach to equilibrium. This fragmentation is not a roadblock to thermalization; instead, the study reveals that finite-size scaling in the team’s fragmented eigenstate thermalization hypothesis (fETH) obeys a symmetry-imposed selection rule that restricts which system s

Aug 16, 2026

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Quantum Zeitgeist Weekly Digest
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quantum-computing

Quantum Zeitgeist Weekly Digest

Welcome to this week’s quantum technology digest. The articles below cover advances across the quantum computing stack, from hardware development and error correction to algorithmic improvements and commercial growth. Several companies reported significant progress this week, indicating continued momentum in the field. This week’s updates demonstrate a clear focus on scaling and refinement. Quantinuum features prominently with announcements regarding both hardware manufacturing partnerships and algorithmic efficiency gains. Other companies, including IonQ and Pasqal, are pushing boundaries in error correction and qubit control. Funding news from D-Wave and Infleqtion’s strong revenue growth further illustrate increasing investment and market demand. Overall, this week highlights practical steps toward building more capable and accessible quantum systems. Progress isn’t limited to a single approach; diverse modalities – superconducting, trapped ion, and neutral atom – all saw encouraging developments. The increasing availability of quantum resources on cloud platforms like Oracle also suggests a move toward wider accessibility for researchers and developers. 1. Quanta Computer & Quantinuum Partner to Scale Quantum Computing Hardware Quantinuum and Quanta Computer are collaborating to manufacture infrastructure for large-scale quantum computers. The partnership combines Quantinuum’s quantum technology with Quanta’s manufacturing expertise, shifting focus from research toward deployable systems. This co-development effort aims to improve the modularity and scalability of quantum processors, supporting Quantinuum’s roadmap for fault-tolerant quantum systems. Quanta’s experience in industrializing advanced computing will establish supply chains and manufacturing processes needed for wider quantum access. Read more 2. IBM’s QOBLIB Library Demonstrates Quantum Advantage in Optimization IBM and its partners announced demonstrations of quantum advantage in optimization t

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Lattice-Based Cryptography Explainedquantum-computing

Lattice-Based Cryptography Explained

Lattice-based cryptography is the branch of modern encryption that hides its secrets inside a grid of points in high-dimensional space. It is the mathematics underneath the two headline standards the United States published in 2024, and it is the reason most of the internet’s future key exchanges will look nothing like the ones running today. This page is about the machinery rather than the policy. If you want the wider picture of the migration, our guide to post-quantum cryptography covers it, and the vendor landscape is mapped separately. What follows is the geometry that lattice-based cryptography is built from, the hard problems, the protocols standing on them, and an honest account of why anyone believes a quantum computer cannot break them. Core assumption Finding short or close vectors in a high-dimensional lattice is hard, even with a quantum computer Workhorse problem Learning With Errors, introduced by Oded Regev in 2005 Standardised as ML-KEM in FIPS 203 and ML-DSA in FIPS 204, both published 13 August 2024 Descended from CRYSTALS-Kyber and CRYSTALS-Dilithium, submitted to the NIST process in November 2017 Status of the security claim No known efficient quantum attack, which is not the same thing as a proof Practical cost Keys and signatures measured in kilobytes rather than tens of bytes Key takeaways A lattice is a repeating grid of points, and the hard part is finding the nearest one. In two dimensions a child can do it by eye, and in the several hundred dimensions lattice-based cryptography uses, nobody knows how. The same lattice can be described by an easy basis or an impossible one. That asymmetry between a short near-orthogonal description and a long skewed one is the trapdoor the whole field is built on. Learning With Errors is linear algebra with the answers slightly wrong. Remove the errors and the system falls to schoolbook elimination, add them back and no efficient method is known. Quantum resistance here is an absence of attack, not a theor

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Spin & Charge Currents Controlled Via Dissipative Processesquantum-computing

Spin & Charge Currents Controlled Via Dissipative Processes

Researchers have demonstrated a method for generating both charge and spin currents using a minimal set of controls: just two jump operators. The work, available on arXiv.org as a preprint with a license, details how these nonreciprocal operators, coupling spin species to different directions of motion, can induce current within a two-dimensional quantum system. By tuning the degree of nonreciprocity within these operators, the team found they could modify the dominant transport mechanism from spin to charge. Crucially, this current generation proved robust even when subjected to dephasing noise, maintaining the necessary steady-state occupation for non-zero currents. Dissipative Engineering for Quantum State Control Researchers investigate the generation and control of both charge and spin currents via nonreciprocal dissipative mechanisms in a two-dimensional system of spinful fermionic atoms, manipulating it with nonreciprocal jump operators. These operators couple each spin species to a different spatial direction of motion; the researchers found that only two such operators are sufficient to generate both types of current. By tuning the degree of nonreciprocity of the jump operators, they modify the dominant transport mechanism from spin to charge. They also checked that this nonreciprocal current generation mechanism is robust to dephasing noise, as even in the presence of this additional dissipative process the steady-state occupation distributions for the quasiparticle modes of the Hamiltonian remains non-trivial, an essential requirement to obtain non-zero currents. The realm of possibility offered by dissipative engineering has significantly grown due to its connection to the field of quantum active matter. Taking inspiration from classical active matter, the design of nonreciprocal dissipative couplings breaking detailed balance has led to the emergence of quantum collective effects not seen in equilibrium situations. Current investigations into actively c

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India National Quantum Mission

Explore India's ₹6,003 Crore quantum initiative: 4 thematic hubs, leading startups, and the latest developments in India's quantum ecosystem

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