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Quantum Simulation of Nucleon-Antinucleon Interaction in Large- QCD on an IBM Quantum Nighthawk Processor

Cameron V. Cogburn, Sebastian Grieninger, Dmitri E. Kharzeev

Featured June 7, 2026

Original Paper

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Simply

Scientists used a quantum computer to study how tiny particles called nucleons and antinucleons interact by turning their complex physics into a simpler spin chain puzzle, then cleverly measuring the interaction despite the computer's errors.

In depth
The paper presents a quantum simulation of nucleon-antinucleon interactions by mapping the complex large- QCD theory to a simpler XXZ spin chain model. The authors implement nonunitary kink and antikink operators on an IBM quantum processor using ancilla-mediated circuits and postselection, demonstrating that the interaction potential can be robustly extracted despite hardware noise due to a clever error-canceling observable definition.

Key Takeaways

  • 1
    Simulates nucleon-antinucleon interactions in large- QCD by mapping the problem to an XXZ spin chain, making it amenable to quantum hardware.
  • 2
    Employs postselected nonunitary disorder operators on an IBM Quantum Nighthawk processor to create and measure kink-antikink states.
  • 3
    Demonstrates robust extraction of the interaction potential from noisy quantum hardware, leveraging a 'difference of differences' observable definition for structured error cancellation.

Conceptual Flow

HIGH LEVEL
1
Methodology: Simulating Complex Physics on Qubits

The scientists simplified a complex particle interaction problem into a spin chain, then used a quantum computer to measure how these spins interact.

Complex Particle Physics
Simplify & Map
Spin Chain Puzzle
Quantum Computer
2
Results: Extracting the Interaction Potential

They successfully measured the attractive force between the simulated particles, showing that quantum computers can reveal fundamental physics.

Quantum Computer Measurements
Calculate Interaction
Attractive Force Found