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Related Experiment Video

Updated: Jan 6, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Remote Blind State Preparation with Weak Coherent Pulses in the Field.

Yang-Fan Jiang^1,2, Kejin Wei^1,2, Liang Huang^1,2

¹Shanghai Branch, National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Shanghai 201315, China.

Physical Review Letters

|October 2, 2019

Summary

This study introduces a resource-efficient protocol for secure, long-distance quantum state transmission, crucial for cloud quantum computing. Experiments demonstrate its feasibility over 100 km fiber, paving the way for secure remote quantum computation.

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Area of Science:

Quantum Information Science
Quantum Communication
Secure Cloud Computing

Background:

Quantum computing advancements necessitate secure methods for delegating computations to cloud servers.
Universal Blind Quantum Computing (UBQC) enables secure delegation but faces challenges in long-distance quantum state transmission.
Existing protocols struggle with secure and reliable transmission of quantum states over extended distances.

Purpose of the Study:

To propose and experimentally verify a resource-efficient Remote Blind Qubit Preparation (RBQP) protocol.
To address the challenge of secure and reliable long-distance quantum state transmission for UBQC.
To demonstrate the feasibility of secure cloud quantum computing through long-distance quantum communication.

Main Methods:

Development of a resource-efficient RBQP protocol utilizing weak coherent pulses and a compact laser.
Experimental verification of a key RBQP step (quantum nondemolition measurement) over 100 km of optical fiber.
Implementation using a quantum teleportation setup operating at telecom wavelengths.

Main Results:

Successful experimental verification of a crucial RBQP step over 100 km fiber.
Generation of 1000 secure qubits with an average fidelity of (86.9±1.5)%.
Achieved fidelity surpasses the quantum no-cloning limit for equatorial qubit states.

Conclusions:

The proposed RBQP protocol enables resource-efficient and secure long-distance quantum state preparation.
Experimental results confirm the feasibility of UBQC over long distances.
This work represents a significant milestone towards the realization of secure cloud quantum computing.