Quantum Authentication Token Using Classical Measurement Outcomes
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Solution Overview
Problem
Current authentication methods, particularly in cryptography, face challenges with unforgeable tokens that are not easily copied and can be transmitted at light speed, as they rely on classical systems that are either cumbersome or expensive to implement, and lack adequate technology for storing and transmitting quantum states.
Innovation Solution
A method using classical measurement outcomes from random quantum states, encoded in photons or weak light pulses, to create an unconditionally secure authentication token that cannot be copied and is limited by light-speed signaling, providing future and past privacy without relying on long-term storage or transmission of quantum states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum states are stored and transmitted to create unforgeable tokens, then security against copying is improved, but device complexity and cost increase beyond current technological feasibility
Solution Approach 1:
The patent extracts only the essential security property from quantum mechanics (the inability to copy unknown quantum states) and applies it through measurement outcomes rather than requiring full quantum state storage and transmission. This removes the cumbersome quantum infrastructure while retaining the unforgeability guarantee.
Solution Approach 2:
The patent creates a classical record (measurement outcome) that cannot be copied because it is derived from a quantum state that cannot be copied. The classical token is a one-way projection of the quantum state, ensuring security without requiring quantum storage.
2Ease of operation
If classical passwords are issued for future authentication points, then ease of operation is improved, but security against multiple redemptions deteriorates
Solution Approach 1:
The patent introduces a quantum state as an intermediary between the issuer and the authentication points. This quantum intermediary cannot be copied, so it can serve as a secure one-time token that maintains both ease of operation (simple classical transmission) and security (cannot be redeemed multiple times).
3Speed
If quantum states are transmitted for authentication, then speed of transmission is improved to light speed, but ease of manufacture and current technological feasibility deteriorate
Solution Approach 1:
The patent replaces the mechanical/physical quantum state storage and transmission system with an optical system using photons. Photons can be transmitted at light speed through standard optical channels, achieving high speed while being technologically feasible with current technology.
Solution Approach 2:
The patent changes the physical parameter from storing quantum states in matter (requiring complex quantum memory) to transmitting quantum information through photons (using standard optical communication), thereby achieving light-speed transmission with current technology.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables secure authentication that respects future privacy and can guarantee past privacy, with the token being easily transmitted at light speed as a classical string of bits, overcoming the limitations of classical systems while being technologically feasible today.
Implementation Method 1
each having associated with it a plurality of random quantum states, each of the quantum states chosen from a set of non-orthogonal quantum states
Data Source
AI summary
Secure, semi-classical authentication schemes are presented. An authentication token is generated by applying a pre-determined measurement to a plurality of random quantum states to obtain a sequence of classical measurement outcomes. The token is validated by receiving the classical measurement outcomes and verifying whether the sequence corresponds to a statistically plausible result for the pre-determined measurement of the plurality of quantum states.