Quantum Control and Information Processing with Rydberg Atoms

Rydberg atoms, in which one electron is excited to a high principal quantum number, present exceptionally strong and tunable interactions that can be harnessed for quantum control and information processing. Trapped in configurable optical tweezer arrays or optical lattices, neutral atoms serve as qubits whose internal states are manipulated by laser fields to induce coherent Rydberg excitation. The hallmark Rydberg blockade mechanism prevents simultaneous excitation of neighbouring atoms within a characteristic radius, enabling the realisation of high-fidelity entangling gates and the generation of many-body quantum states. Advances in pulse shaping, optimal control and dynamical modulation have pushed gate fidelities beyond thresholds required for error correction, while novel schemes such as Floquet engineering extend the interaction range and connectivity of qubit arrays. These capabilities underpin applications in digital quantum computing, analogue quantum simulation of spin models, quantum optimisation and precision metrology. The combination of scalable architectures, low decoherence and flexible geometry positions Rydberg platforms at the forefront of efforts to build fault-tolerant quantum processors and simulators with global significance for materials science, cryptography and fundamental studies of quantum matter.

Research from Nature Portfolio

Recent studies have achieved two-qubit entangling gates with up to 99.5% fidelity on parallel arrays of sixty atoms, employing optimised single-pulse excitation, atomic dark states to suppress scattering and refined cooling and excitation protocols. These advances surpass error thresholds essential for surface-code error correction and demonstrate scalable implementation of multi-qubit gates. Work on Floquet frequency modulation has broken the conventional blockade-radius limit, realising entanglement over extended distances and enhancing qubit connectivity without sacrificing coherence. The same approach permits access to anti-blockade regimes, facilitating preparation of long-lived, strongly interacting pair states. Foundational efforts have also demonstrated dynamic, non-local connectivity by coherently transporting entangled atom arrays between operation zones. This architecture enabled programmable synthesis of large graph and surface-code states, hybrid analogue–digital evolutions and studies of entanglement dynamics in many-body systems, marking a crucial step towards modular, error-corrected quantum processors.

Research from all publishers

Midcircuit operations have been implemented in fifty-site neutral atom arrays by exploiting a three-level qubit encoding in optical-metastable-ground states. This enables nondestructive measurement, feed-forward control and local reset without disturbing unmeasured atoms, a key requirement for quantum error correction. In another development, explicit mappings of a broad class of combinatorial optimisation problems to maximum-weighted independent set tasks on unit-disk graphs have been constructed for Rydberg arrays. Numerical simulations indicate that adiabatic quantum optimisation on such platforms can address problems with arbitrary connectivity beyond the constraints of hardware geometry. These studies open pathways to hardware-efficient quantum algorithms and practical demonstrations of quantum advantage in optimisation.

Quantum Control and Information Processing with Rydberg Atoms publication trend

The graph below shows the total number of articles in quantum control and information processing with rydberg atoms across all publications each year (not limited to Nature Index journals).

Technical terms

Rydberg blockade: A phenomenon in which strong interactions between Rydberg atoms prevent simultaneous excitation of nearby atoms within a characteristic distance, enabling controlled multi-qubit logic operations.

Optical tweezer: A highly focused laser beam used to trap and manipulate individual neutral atoms at predetermined positions with submicrometre precision.

Entangling gate: A quantum logic operation that generates non-classical correlations (entanglement) between two or more qubits, essential for universal quantum computing.

Floquet modulation: The use of periodic driving of system parameters (for example, laser frequency or amplitude) to engineer effective interactions and extend control capabilities.

Midcircuit operation: A partial projective or reset operation applied to a subset of qubits during a quantum circuit, allowing error detection or adaptive control without collapsing the entire register.

References

1. High-fidelity parallel entangling gates on a neutral-atom quantum computer. Nature (2023).
2. Floquet-tailored Rydberg interactions. Nature Communications (2023).
3. A quantum processor based on coherent transport of entangled atom arrays. Nature (2022).
4. Midcircuit Operations Using the omg Architecture in Neutral Atom Arrays. Physical Review X (2023).
5. Quantum Optimization with Arbitrary Connectivity Using Rydberg Atom Arrays. PRX Quantum (2023).