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Quantum dense coding with atomic qubits.

T Schaetz1, M D Barrett, D Leibfried

  • 1Time and Frequency Division, NIST, Boulder, Colorado 80305-3328, USA.

Physical Review Letters
|August 25, 2004
PubMed
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Researchers demonstrated quantum dense coding using two trapped beryllium ions (9Be+). This method successfully encoded two classical bits per qubit, achieving high fidelity and channel capacity for quantum communication.

Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Communication

Background:

  • Quantum dense coding enables sending two classical bits of information by transmitting only one qubit.
  • Implementing quantum communication protocols with atomic qubits is crucial for scalable quantum networks.

Purpose of the Study:

  • To implement and demonstrate quantum dense coding using individual atomic qubits.
  • To characterize the performance of the quantum dense coding protocol with trapped ions.

Main Methods:

  • Utilized two trapped 9Be+ ions as individual atomic qubits.
  • Performed a complete Bell state measurement to distinguish the four encoded operations.
  • Implemented the quantum dense coding protocol.

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Main Results:

  • Achieved an average transmission fidelity of 0.85(1).
  • Determined a channel capacity of 1.16(1), exceeding the classical limit.
  • Successfully encoded two bits of classical information per qubit.

Conclusions:

  • The experimental implementation validates quantum dense coding with atomic qubits.
  • The high fidelity and channel capacity demonstrate the potential of trapped ions for quantum communication.