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Updated: Apr 10, 2026
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
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High-fidelity collisional quantum gates with fermionic atoms.
Petar Bojović1,2, Timon Hilker1,2,3, Si Wang1,2
1Max-Planck-Institut für Quantenoptik, Garching, Germany.
Nature
|April 8, 2026
Summary
Researchers developed high-fidelity entangling gates for fermionic atoms using controlled collisions in optical lattices. This breakthrough enables robust quantum simulations and advances the development of digital quantum computers for complex chemistry problems.
Area of Science:
- Quantum Computing
- Atomic Physics
- Quantum Simulation
Background:
- Quantum simulations are key for understanding electronic structure and quantum phases.
- Neutral-atom platforms offer scalable architectures for quantum computation.
- Fermionic encodings are crucial for accurate quantum simulations, but require high-fidelity gates.
Purpose of the Study:
- To demonstrate high-fidelity, motionally coherent entangling gates for fermionic atoms.
- To unify analogue and digital quantum simulation capabilities on neutral-atom platforms.
- To advance the development of programmable fermionic quantum processors.
Main Methods:
- Utilized controlled interactions of fermionic atoms in an optical superlattice.
- Employed quantum gas microscopy for microscopic characterization of gates.
- Implemented spin-exchange and pair-tunnelling gates, including a composite pair-exchange gate.
Main Results:
- Achieved collisional entangling gate fidelities up to 99.75(6)%.
- Demonstrated Bell-state lifetimes exceeding 10 seconds.
- Characterized spin-exchange and pair-tunnelling gates, realizing a robust composite gate.
Conclusions:
- Controlled collisions in optical lattices provide a competitive route to high entangling gate fidelities.
- This method is intrinsically suited for fermionic statistics, crucial for many-qubit systems.
- The demonstrated gates are a significant step towards digital fermionic quantum computers and hybrid simulators.
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