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Demonstration of a small programmable quantum computer with atomic qubits.

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A new five-qubit trapped-ion quantum computer demonstrates software programmability for arbitrary quantum algorithms. This flexible quantum computing platform achieves high fidelity for executing various quantum logic gates and algorithms.

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Area of Science:

  • Quantum Computing
  • Ion Traps
  • Quantum Information Science

Background:

  • Conventional computers face limitations in solving complex problems.
  • Existing quantum computing platforms often have hardware-specific limitations.
  • Demonstrating versatile quantum algorithms is crucial for advancing quantum computation.

Purpose of the Study:

  • To demonstrate a programmable five-qubit trapped-ion quantum computer.
  • To enable the execution of arbitrary quantum algorithms via software reconfiguration.
  • To achieve high fidelity for universal quantum logic gates.

Main Methods:

  • Utilized a five-qubit trapped-ion system.
  • Compiled quantum algorithms into sequences of universal quantum logic gates native to the hardware.
  • Implemented algorithms by reconfiguring gate sequences in software.

Main Results:

  • Achieved a mean gate fidelity of 98%.
  • Successfully implemented the Deutsch-Jozsa and Bernstein-Vazirani algorithms with high success rates (95% and 90%).
  • Performed quantum Fourier transform on five qubits with average fidelities of 62% (phase estimation) and 84% (period finding).

Conclusions:

  • The demonstrated trapped-ion quantum computer offers hardware flexibility for diverse quantum algorithms.
  • The system is scalable to larger qubit numbers and modular expansion.
  • This work advances the development of practical and versatile quantum computing systems.