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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Computing

Background:

  • Metastable atomic qubits offer scalability and error conversion advantages for quantum computers.
  • Strontium-88's metastable fine-structure qubit is encoded between the 3P0 and 3P2 states.

Purpose of the Study:

  • To demonstrate and characterize a high-fidelity quantum gate set for the strontium-88 metastable fine-structure qubit.
  • To develop a novel state-resolved detection scheme for high-fidelity qubit loss detection.
  • To leverage a stable ground state for midcircuit erasure conversion.

Main Methods:

  • Implementation and characterization of single- and two-qubit gates.
  • Development of a state-resolved detection scheme for fine-structure states.
  • Utilizing fast destructive imaging for midcircuit erasure conversion.

Main Results:

  • Achieved single-qubit gate fidelities of 0.993(1).
  • Achieved two-qubit gate fidelities of 0.9945(6) after loss correction.
  • Demonstrated high-fidelity qubit loss detection and midcircuit erasure conversion.

Conclusions:

  • The strontium fine-structure qubit is a promising platform for near-term error-corrected quantum computers.
  • The demonstrated gate set and detection scheme enhance qubit control and error management.
  • This work provides unique scaling perspectives for quantum computing architectures.