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.
The cover shows the two‐qubit controlled‐phase (CP) gate implementation with flying photons and an atomic‐ensemble quantum memory. This hybrid CP gate is one of the key building blocks for distributed quantum computing scheme proposed in article number 2300007 by Shengwang Du and co‐workers.
A photon source with high-dimensional entanglement is able to bring increasing capacity of information in quantum communication. The dimensionality is determined by the chosen degree of freedom of the photons and is limited by the complexity of the physical systems. Here we propose a new type of high-dimensional entangled photon source, generated via path-indistinguishable scheme from a two-dimensional atomic cloud, which is prepared in a magneto-optical trap. To verify the photon source, we demonstrate experimentally the quantum state of the single photons heralded by its partner photon, with homodyne tomographic technology.
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 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, a universal distributed quantum computing scheme based on photons and atomic-ensemble-based quantum memories is proposed. Taking the established photonic advantages, two-qubit nonlinear interaction is mediated by converting photonic qubits into quantum memory states and employing Rydberg blockade for the controlled gate operation. Spatial and temporal scalability of this scheme is demonstrated further. These results show photon-atom network hybrid approach can be a potential solution to universal distributed quantum computing.
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