Abstract
We propose a novel one-way quantum repeater architecture based on photonic tree-cluster states. Encoding a qubit in a photonic tree-cluster protects the information from transmission loss and enables long-range quantum communication through a chain of repeater stations. As opposed to conventional approaches that are limited by the two-way communication time, the overall transmission rate of the current quantum repeater protocol is determined by the local processing time enabling very high communication rates. We further show that such a repeater can be constructed with as little as two stationary qubits and one quantum emitter per repeater station, which significantly increases the experimental feasibility. We discuss potential implementations with diamond defect centers and semiconductor quantum dots efficiently coupled to photonic nanostructures and outline how such systems may be integrated into repeater stations.
Highlights
Encoding information in quantum systems is the fundamental principle of quantum information technologies, ranging from quantum computers [1] to unconditionally secure communication [2]
Correction of losses requires only a single Bell measurement independent of the size of the tree encoding. This constitutes a significant reduction in overhead as compared to, e.g., one-way quantum repeaters based on the quantum parity encoding [11,12,15], which requires a number of two-qubit operations that scale linearly with the size of the encoding corresponding to hundreds of memory qubits per repeater station [7]
We have proposed a novel one-way quantum repeater based on photonic tree-cluster states
Summary
Encoding information in quantum systems is the fundamental principle of quantum information technologies, ranging from quantum computers [1] to unconditionally secure communication [2]. The need for heralding limits the communication rate at which quantum information can be distributed and requires long-lived quantum memories with efficient light-matter coupling [8,9] To overcome these limitations, one-way and all-photonic quantum repeaters have been proposed [10,11,12,13,14,15,16]. Correction of losses requires only a single Bell measurement independent of the size of the tree encoding This constitutes a significant reduction in overhead as compared to, e.g., one-way quantum repeaters based on the quantum parity encoding [11,12,15], which requires a number of two-qubit operations that scale linearly with the size of the encoding corresponding to hundreds of memory qubits per repeater station [7]. Many of the required parameters for our protocol are not far from current state-of-the art performances, which together with the significant resource reduction compared to previous one-way protocols cements the experimental feasibility of our approach
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