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Quantum Chaos Simulation on 91-Qubit Processor Using Error Mitigation Breakthrough Large-Scale Quantum Chaos Finally Within Reach of Near-Term Quantum Computers The study of quantum chaos aims to translate chaotic classical dynamics into quantum terms, but practical simulations have been held back by limited computing power. Using advanced error mitigation and custom-designed circuits on a 91-qubit superconducting quantum processor , researchers have demonstrated a promising new approach. The work is reported in Nature Physics . Error Mitigation Instead of Error Correction Reliable quantum simulations demand the suppression of errors, yet full-scale quantum error correction comes at the cost of significant qubit and control overheads . Until now, researchers have largely sidestepped this challenge by focusing on smaller quantum many-body systems or on integrable models that exhibit limited chaos. In the new study, the team adopted a different strategy. Rather than eliminating noi...

New Simulation Framework Bridges Atomic and Large-Scale Physics in Fusion Research Extreme Conditions Inside Inertial Confinement Fusion In inertial confinement fusion, a tiny fuel capsule starts out at near-zero temperatures and under almost vacuum-like pressure. When powerful lasers compress the fuel to initiate fusion, it is rapidly heated to millions of degrees and squeezed to pressures comparable to those at the Sun's core   —  all within an extraordinarily small space and an instant of time. To make sense of this extreme transformation, scientists must understand large-scale conditions such as temperature and pressure across the entire target chamber. At the same time, they require detailed insight into the behaviour of the material and its individual atoms . Until recently, computer simulations have struggled to connect these vastly different scales and conditions within a single model. Related fusion and physics coverage: Advanced energy and fusion science New Sim...

Researchers Compute Jones Polynomial Using Majorana Zero Modes Introduction to Jones Polynomials and Topological Invariants A research team has successfully calculated the Jones polynomial ex perimentally using quantum simulations of braided Majorana zero modes. By simulating the braiding o perations of Majorana fermions, they determined the Jones  polynomials for various links. Their findings were  published in Physical Review Letters . Im portance of Jones Polynomials in To pology Link and Knot Invariants Invariants of links or knots, like the Jones  polynomials, are essential tools for assessing the to pological equivalence of knots. Their determination is of significant interest due to a p plications s panning fields like DNA biology and condensed matter  physics . Com putational Challenges and the Promise of Quantum Simulations A p proximating the Jones  polynomials is a com putationally challenging task, classified as #P-hard, with classical algorithms d...

Unlocking Quantum Simulations: Scientists Develop Techniques for Estimating Hamiltonian Parameters in Superconducting Quantum Simulators Introduction Scientists from Freie University Berlin, University of Maryland, NIST, Google AI, and Abu Dhabi aimed to estimate the free Hamiltonian parameters of bosonic excitations in su perconducting quantum simulators. Their  protocols, shared in an arXiv  pre print, could enable highly  precise quantum simulations that sur pass classical com puting. The Call from Google AI Jens Eisert, the  pa per's lead author, told "I was attending a conference in Brazil when i got a call from colleagues at the Google AI team." Challenges in Calibrating Quantum Chi ps "While working to calibrate their Sycamore su perconducting quantum chi p with Hamiltonian learning methods, they encountered substantial difficulties and called for hel p. With my background in analog quantum simulation and systems identification, I found their request  pa...