Neutral Atom Quantum Computing

Neutral atom quantum computing uses individual atoms—typically alkali metals like Rubidium or Strontium—trapped by laser beams called optical tweezers. Unlike charged ions used in trapped-ion quantum computers, these atoms are electrically neutral, which provides both advantages and unique challenges.

The basic operation involves trapping atoms in arrays of optical tweezers, rearranging them into desired configurations, exciting them to Rydberg states (where electrons orbit far from the nucleus), and letting them interact through van der Waals forces. This creates entanglement and enables quantum gates.

What makes neutral atoms particularly exciting is their scalability. Companies like QuEra, Pasqal, and Atom Computing have demonstrated systems with hundreds of qubits, far exceeding the qubit counts of superconducting systems. The atoms can be arranged in arbitrary 2D and even 3D geometries, enabling novel connectivity patterns.

Key capabilities include:

• •All-to-all connectivity: Any two atoms can interact by being moved close together or excited to Rydberg states simultaneously.
• •Dynamic reconfiguration: Atoms can be moved mid-computation to optimize connectivity for specific algorithms.
• •Erasure detection: Lost atoms can be detected without destroying quantum information in remaining atoms.
• •Identical qubits: All atoms of the same isotope are fundamentally identical, eliminating manufacturing variation issues.

Neutral atom quantum computing has emerged as one of the most promising platforms for scaling to thousands of qubits. The field is advancing rapidly:

Commercial and Academic Activity

Several organizations worldwide are advancing neutral atom quantum computing, including commercial ventures building analog and gate-based systems, as well as academic research groups exploring the underlying physics. We follow these developments to inform our own research direction — we are an independent research group with no affiliation to any of these organizations.

Platform Characteristics

• •Coherence times: Seconds to tens of seconds—much longer than superconducting qubits (microseconds to milliseconds).
• •Gate fidelities: Currently 99%+ for single-qubit gates, 97-99% for two-qubit gates—improving rapidly but still below superconducting.
• •Operation modes: Both analog (Hamiltonian simulation) and digital (gate-based) computing possible on same hardware.
• •Atom loss: Atoms can escape traps—a unique error mode that can be detected (erasure) but must be handled.