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Experimental Quantum Fingerprinting without the Shared Randomness Loophole.

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Summary
This summary is machine-generated.

Quantum fingerprinting (QF) offers significant data reduction for communication tasks. A new asynchronous method demonstrates practical QF without shared randomness, outperforming classical algorithms over 20 km.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication

Background:

  • Quantum fingerprinting (QF) protocols offer exponential speedups for communication complexity tasks.
  • Previous implementations relied on direct optical links, violating the no-shared-randomness rule.

Purpose of the Study:

  • To develop and demonstrate a practical quantum fingerprinting protocol immune to shared randomness.
  • To overcome the limitations of existing QF implementations using coherent optical fields.

Main Methods:

  • Proposed a novel QF protocol utilizing asynchronous coincidence pairing.
  • Experimentally demonstrated the protocol using remotely and independently prepared coherent optical fields over 20 km of telecom fiber.

Main Results:

  • The asynchronous QF protocol successfully operated without shared randomness.
  • Achieved a performance superior to the best-known classical algorithms for communication complexity tasks.
  • Demonstrated the feasibility of QF over a 20 km fiber link.

Conclusions:

  • This work presents the first QF demonstration resilient to shared randomness.
  • The developed protocol paves the way for practical applications of quantum fingerprinting.
  • Advances in quantum communication complexity are enabled by this loophole-free QF implementation.