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  3. Hardware-efficient Quantum Error Correction Via Concatenated Bosonic Qubits.
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  3. Hardware-efficient Quantum Error Correction Via Concatenated Bosonic Qubits.

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Hardware-efficient quantum error correction via concatenated bosonic qubits.

Harald Putterman1, Kyungjoo Noh2, Connor T Hann2

  • 1AWS Center for Quantum Computing, Pasadena, CA, USA. putterma@amazon.com.

Nature
|February 26, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

Researchers developed a hardware-efficient quantum error correction method using concatenated bosonic codes. This approach significantly reduces errors in logical qubits, paving the way for fault-tolerant quantum computation.

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Area of Science:

  • Quantum Computing
  • Quantum Error Correction
  • Superconducting Circuits

Background:

  • Quantum computers require quantum error correction for practical applications, but current methods have high physical qubit overhead.
  • Hardware-efficient approaches are crucial for scaling quantum computing.

Purpose of the Study:

  • To realize a logical qubit memory using concatenated bosonic codes for improved hardware efficiency.
  • To investigate the performance and scaling of this new error correction strategy.

Main Methods:

  • Utilized a superconducting quantum circuit to implement concatenated bosonic cat qubits with an outer repetition code (distance d=5).
  • Employed a stabilizing circuit for passive protection against bit flips and ancilla transmons for phase flip correction.
  • Demonstrated a noise-biased CX gate for cat-transmon systems to suppress logical bit-flip errors.

Main Results:

  • Achieved a logical qubit memory with a phase-flip correcting repetition code operating below the error threshold.
  • Demonstrated suppression of logical bit-flip errors with increasing cat qubit mean photon number.
  • Measured minimum logical error rates of 1.75(2)% for distance-3 and 1.65(3)% for distance-5 codes.

Conclusions:

  • Concatenated bosonic codes offer a hardware-efficient path to fault-tolerant quantum computation.
  • The intrinsic error suppression of bosonic encodings is key to using efficient outer error-correcting codes.
  • This approach shows promise for building scalable and robust quantum computers.