Neutral Atom 2 QPUs available

Neutral Atom Quantum Computing

Neutral atom quantum computers use arrays of individual atoms (typically rubidium or cesium) trapped in optical tweezers — tightly focused laser beams. Qubits are encoded in atomic hyperfine states. Entangling gates use Rydberg excitations, where atoms are temporarily promoted to highly excited states with strong long-range interactions. Arrays can be dynamically reconfigured in 2D or 3D.

Operating Temp

Room temperature environment (atoms cooled to ~µK)

Gate Speed

0.1 µs – 1 ms per gate

Typical Fidelity

98–99.5% for 2-qubit gates

Scalability

Very high — arrays of 6,000+ atoms demonstrated

Key Advantage

Large qubit counts (100–10,000+ atoms in reconfigurable arrays), programmable connectivity via atom repositioning, and operation at room temperature (atoms laser-cooled to µK). Naturally suited to analog quantum simulation.

Key Challenge

Gate fidelities are lower than trapped-ion systems, coherence times are shorter, and mid-circuit measurement and classical feedback are still maturing. Rydberg blockade errors limit 2-qubit gate fidelity.

Neutral Atom QPUs (2)

QPU	Qubits	2Q Fidelity	QV	Status	Best Price	Link
QuEra Aquila QuEra Computing	256	99.50%	—	Active	From $0.0100/shot	Details
Pasqal Fresnel Pasqal	100	99.50%	—	Active	From $0.00/shot	Details

Use Cases

Combinatorial optimization Quantum simulation of materials Quantum error correction Many-body physics research Drug discovery

Frequently Asked Questions

How do neutral atom QPUs differ from trapped-ion systems?

While both use individual atoms as qubits, neutral atoms are held by optical tweezers (focused laser beams) rather than electromagnetic traps. Neutral atoms use Rydberg excitations for entangling gates rather than Coulomb interactions. They can be rearranged in 2D/3D arrays, enabling reconfigurable connectivity at the cost of lower gate fidelity than trapped ions.

What is the Rydberg blockade?

The Rydberg blockade is the mechanism behind neutral-atom two-qubit gates. When one atom is excited to a Rydberg state, a nearby atom cannot simultaneously be excited due to strong van der Waals interactions. This conditional behavior implements a controlled-Z gate and enables entanglement between neighboring atoms.

How many qubits can neutral atom QPUs have?

Commercial neutral atom QPUs currently have 100–256 qubits (QuEra Aquila: 256, Pasqal Fresnel: 100). Research systems have demonstrated arrays of 6,000+ atoms. The scalability is fundamentally different from superconducting — more atoms can be added to the optical tweezer array without complex wiring.

Are neutral atom QPUs gate-based or analog?

QuEra Aquila operates primarily in analog mode (Hamiltonian simulation) though gate-based operation is being developed. Pasqal Fresnel supports both analog and digital (gate-based) operation. Analog mode is particularly powerful for optimization and quantum simulation of condensed matter systems.

What is the pricing for neutral atom QPU access?

QuEra Aquila is accessible via Amazon Braket at $0.01 per shot + $0.30 per task. Pasqal Fresnel is available on Azure Quantum at $0.025 per shot + $0.50 per task. Both platforms also offer emulator access for circuit development at lower cost.

Compare With Other Technologies

Neutral Atom vs Superconducting

0.1 µs – 1 ms per gate gates vs 10–700 ns per gate

Compare QuEra Aquila vs IBM Heron r2 →

Neutral Atom vs Trapped Ion

0.1 µs – 1 ms per gate gates vs 1 µs – 1 ms per gate

Compare QuEra Aquila vs Quantinuum H2-1 →

Neutral Atom vs Photonic

0.1 µs – 1 ms per gate gates vs Picoseconds for passive operations; detector timing ~ns

Compare QuEra Aquila vs Xanadu Borealis →

Neutral Atom vs Topological

0.1 µs – 1 ms per gate gates vs Not yet characterized at scale

Compare QuEra Aquila vs Microsoft Majorana 1 →