A quantum computer just simulated energy turning into matter, live

[Rhys74]

Researchers led by Roland Farrell and Nobel laureate John Preskill at Caltech, alongside Nikita Zemlevskiy and Marc Illa at the University of Washington, reported the first digital quantum simulation of inelastic particle production, the process where the raw kinetic energy of a collision converts into entirely new particles that didn't exist beforehand. Published in Nature Physics, the team ran the simulation on IBM's 104-qubit ibm_marrakesh processor, using up to 5,589 two-qubit gates, making it one of the deepest quantum scattering simulations reported to date

The core technical challenge wasn't simulating the collision itself, but preparing physically realistic starting conditions, two well-defined wavepackets of particles moving toward each other. Previous methods for creating these wavepackets scaled poorly as lattice size grew, but the team's new approach uses W states, a form of quantum entanglement spread across many qubits, combined with mid-circuit measurements and feed-forward operations, keeping the preparation circuit's depth constant regardless of how large the simulated space becomes, a critical property for eventually scaling to genuinely useful problem sizes

By measuring the skewness of the energy left behind after collisions in a simplified model called the one-dimensional Ising field theory, the team detected a clear signature, one light and one heavier particle emerging from the wreckage, direct evidence that collision energy had converted into new mass. The researchers stress this remains a one-dimensional, simplified system studied through error mitigation rather than full error correction, with extending toward realistic higher-dimensional theories like quantum chromodynamics still a significant unsolved challenge. Curious what people think this specific milestone means for quantum computing's role in fundamental physics, does solving the wavepacket preparation bottleneck represent the harder problem now cracked, or does scaling to genuinely three-dimensional, experimentally relevant theories remain a comparably difficult separate mountain still to climb

Quantum Computer Recreates Particle Collisions That Turn Energy Into Matterbioengineer.org

[Slay40]

Making the preparation circuit's depth independent of the simulated volume is genuinely the elegant breakthrough buried in all this technical detail, that's the specific property that actually makes future scaling plausible rather than just theoretically possible

[Calm Paige]

104 qubits and nearly 5,600 two-qubit gates is a serious scale for this kind of simulation, worth appreciating how much noise and error mitigation had to be managed to extract a clean physical signal from a circuit this deep

[Gunther92]

John Preskill's involvement gives this genuine additional weight given how influential his own framing of near-term quantum computing's realistic limits has been across the whole field for years now

[StarKnight90]

The one-dimensional simplification is an important caveat to keep in mind, real particle colliders operate in three dimensions with vastly more complex interactions, this is a genuinely important proof of concept rather than an immediately applicable tool

[NatureBoy86]

Skewness of the energy density as the actual measured signal is a clever choice, it's a single number that cleanly distinguishes an elastic bounce from a genuine energy-to-matter conversion event without needing to reconstruct the full final state