Distributed quantum computing with photons and atomic memories

Abstract

The promise of universal quantum computing requires scalable single- and inter-qubit control interactions. Currently, three of the leading candidate platforms for quantum computing are based on superconducting circuits, trapped ions, and neutral atom arrays. However, these systems have strong interaction with environmental and control noises that introduce decoherence of qubit states and gate operations. Alternatively, photons are well decoupled from the environment, and have advantages of speed and timing for distributed quantum computing. Photonic systems have already demonstrated capability for solving specific intractable problems like Boson sampling, but face challenges for practically scalable universal quantum computing solutions because it is extremely difficult for a single photon to "talk" to another deterministically. Here, we propose a universal distributed quantum computing scheme based on photons and atomic-ensemble-based quantum memories. Taking the established photonic advantages, we mediate two-qubit nonlinear interaction by converting photonic qubits into quantum memory states and employing Rydberg blockade for controlled gate operation. We further demonstrate spatial and temporal scalability of this scheme. Our results show photon-atom network hybrid approach can be an alternative solution to universal quantum computing.

6 pages, 5 figures

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Cited by in corpus (5)

• Nonlocal photonic quantum gates over 7.0 km
• Deterministic generation of multi-qubit entangled states among distant parties using indefinite causal order
• S-QGPU: Shared Quantum Gate Processing Unit for Distributed Quantum Computing
• Practical implementation of arbitrary nonlocal controlled-unitary gate via indefinite causal order
• RELiQ: Scalable Entanglement Routing via Reinforcement Learning in Quantum Networks