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Experimental Quantum Randomness Processing Using Superconducting Qubits.

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This summary is machine-generated.

Quantum coherence, not just entanglement, offers advantages in information processing. This study demonstrates a quantum protocol using coherence alone, proving its power beyond classical capabilities.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Quantum Optics

Background:

  • Multipartite quantum correlations, such as entanglement, are crucial for quantum information processing.
  • A recent study showed quantum coherence alone can outperform classical mechanics in randomness processing.
  • The persistence of quantum advantages solely through multipartite correlations was questioned.

Purpose of the Study:

  • To investigate if quantum advantages can be achieved using only quantum coherence, without entanglement.
  • To propose and experimentally demonstrate a theoretical protocol for randomness processing.
  • To highlight the role of quantum coherence in information processing independent of multipartite correlations.

Main Methods:

  • Theoretical protocol design for a quantum Bernoulli factory.
  • Experimental implementation using a superconducting qubit in circuit quantum electrodynamics.
  • Utilization of a nearly quantum-limited parametric amplifier for high-fidelity operations.
  • Quantum state preparation and measurement.

Main Results:

  • Demonstration of a protocol that is classically impossible.
  • Successful implementation using quantum coherence without entanglement.
  • High-fidelity quantum state preparation and measurement achieved.
  • Experimental validation of quantum coherence's advantage in information processing.

Conclusions:

  • Quantum coherence of a single qubit provides a distinct advantage in information processing.
  • Quantum advantages are not solely reliant on multipartite correlations like entanglement.
  • This work expands the understanding of quantum resources for information processing.