- Caltech trapped 6,100 cesium atoms to form the largest neutral-atom quantum computer.
- The qubits maintained coherence for 13 seconds and operated at 99.98% accuracy.
- The team used optical tweezers to hold and move atoms without disturbing their quantum state.
- This system overcomes typical scaling challenges in quantum computing fidelity and stability.
- Neutral-atom quantum computers offer reconfigurability and are advancing as strong competitors to other quantum technologies.
Researchers at Caltech have developed the largest neutral-atom quantum computer by trapping 6,100 cesium atoms as qubits in a single array. This breakthrough, published in Nature on Thursday, marks a significant increase from previous devices that held only hundreds of qubits.
The team reported qubits stayed coherent—meaning their delicate quantum state remained stable—for about 13 seconds and achieved single-qubit operations with 99.98% accuracy. These measurements show they maintained both precision and stability while scaling to over 6,000 qubits.
A qubit is the basic unit of quantum information, able to exist in a superposition of states simultaneously, unlike a classical bit that is either 0 or 1. The main challenge in quantum computing is keeping this superposition stable long enough to perform many accurate operations. Caltech’s graduate student Elie Bataille explained, “What you need is a very long coherence time compared to the duration of your operations”. In this case, operations take about one microsecond, allowing roughly one million operations within the coherent time frame.
To trap and control the atoms, the researchers used “optical tweezers,” focused laser beams that can hold atoms steady. The team split a laser into 12,000 light traps to hold all 6,100 atoms inside a vacuum. They further demonstrated moving atoms across the array without losing their superposition, a key feature for future error correction in quantum processors.
Neutral-atom quantum systems are gaining traction as contenders alongside superconducting circuits and trapped-ion technologies. A key advantage is that atoms can be physically rearranged during computation, providing flexible connectivity that rigid hardware designs cannot easily match. This 6,100-qubit system thus represents a notable milestone by combining size, accuracy, and long coherence.
Around the world, companies are advancing large-scale quantum machines. IBM aims to build a 100,000-qubit superconducting computer by 2033, while firms such as IonQ and QuEra focus on ion-trap and neutral-atom methods. Colorado-based Quantinuum targets a fully fault-tolerant quantum computer by 2029.
The next critical step is demonstrating error correction at scale by encoding reliable “logical qubits” from thousands of physical ones. Bataille noted, “A traditional computer makes one error every 10 to 17 operations. A quantum computer is nowhere near that accurate.” The team plans to link the qubits through entanglement to enable full-scale quantum computations.
Although the Caltech 6,100-qubit array is not yet a practical quantum computer, it sets a new benchmark. By uniting coherence, accuracy, and scale, it strengthens the position of neutral-atom platforms in the race toward more powerful quantum machines.
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