Remote blind state preparation with weak coherent pulses in the field

Abstract

Quantum computing has seen tremendous progress in the past years. Due to the implementation complexity and cost, the future path of quantum computation is strongly believed to delegate computational tasks to powerful quantum servers on cloud. Universal blind quantum computing (UBQC) provides the protocol for the secure delegation of arbitrary quantum computations, and it has received significant attention. However, a great challenge in UBQC is how to transmit quantum state over long distance securely and reliably. Here, we solve this challenge by proposing and demonstrating a resource-efficient remote blind qubit preparation (RBQP) protocol with weak coherent pulses for the client to produce, using a compact and low-cost laser. We demonstrate the protocol in field, experimentally verifying the protocol over 100-km fiber. Our experiment uses a quantum teleportation setup in telecom wavelength and generates $1000$ secure qubits with an average fidelity of $(86.9\pm 1.5)\%$, which exceeds the quantum no-cloning fidelity of equatorial qubit states. The results prove the feasibility of UBQC over long distances, and thus serving as a key milestone towards secure cloud quantum computing.

11 pages, 9 figures

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Cited by in corpus (9)

• Secure quantum key distribution with realistic devices
• Simple Quantum Key Distribution with qubit-based synchronization and a self-compensating polarization encoder
• Stable, low-error and calibration-free polarization encoder for free-space quantum communication
• Multi-client distributed blind quantum computation with the Qline architecture
• Robust and efficient verification of graph states in blind measurement-based quantum computation
• Quantum cryptography beyond key distribution: theory and experiment
• Towards practical secure delegated quantum computing with semi-classical light
• A Sagnac-based arbitrary time-bin state encoder for quantum communication applications
• Optical Quantum Computing