Orthogonality Broadcasting and Quantum Position Verification

• URL: http://arxiv.org/abs/2311.00677v2
• Date: Wed, 30 Oct 2024 08:02:44 GMT
• Title: Orthogonality Broadcasting and Quantum Position Verification
• Authors: Ian George, Rene Allerstorfer, Philip Verduyn Lunel, Eric Chitambar,
• Abstract summary: Security in quantum cryptographic protocols derives from a possibly weaker property that classical information encoded in certain quantum states cannot be broadcast. We introduce the study of "orthogonality broadcasting"
• Score: 3.549868541921029
• License:
• Abstract: The no cloning theorem leads to information-theoretic security in various quantum cryptographic protocols. However, this security typically derives from a possibly weaker property that classical information encoded in certain quantum states cannot be broadcast. To formally capture this property, we introduce the study of "orthogonality broadcasting." When attempting to broadcast the orthogonality of two different qubit bases, we establish that the power of classical and quantum communication is equivalent. However, quantum communication is shown to be strictly more powerful for broadcasting orthogonality in higher dimensions. We then relate orthogonality broadcasting to quantum position verification and provide a new method for establishing error bounds. Our key technical contribution is an uncertainty relation that uses the geometric relation of the states that undergo broadcasting rather than the non-commutative aspect of the final measurements.

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