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Fault-tolerant interface between quantum memories and quantum processors.

Hendrik Poulsen Nautrup1, Nicolai Friis2,3, Hans J Briegel2

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Switching between topological error correction codes is crucial for fault-tolerant quantum computation. Subsystem lattice surgery enables seamless transfer of quantum information between different codes, enhancing quantum memory and processing capabilities.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Error Correction Codes

Background:

  • Topological error correction codes offer robust protection for quantum computations against noise.
  • Different codes excel in specific areas, such as quantum memory (high noise thresholds) or data processing (easy gate implementation).
  • The ability to transition between these codes is essential for advanced fault-tolerant quantum computation.

Purpose of the Study:

  • To propose a practical method for switching between diverse topological error correction codes.
  • To enable the fault-tolerant transfer of quantum information between arbitrary topological subsystem codes.
  • To facilitate the creation of interfaces, like quantum buses, between different types of topological codes.

Main Methods:

  • Introduction of subsystem lattice surgery, a novel technique for code switching.
  • Requirement of only two-body nearest-neighbor interactions within a fixed layout.
  • Integration with essential error correction protocols.

Main Results:

  • Demonstration of fault-tolerant transfer of quantum information between arbitrary topological subsystem codes in 2D and beyond.
  • Successful creation of a quantum bus interface.
  • Facilitation of communication between noise-resilient surface code memories and flexible color code processors.

Conclusions:

  • Subsystem lattice surgery provides a practical and efficient method for inter-code information transfer.
  • This technique enhances the flexibility and applicability of topological error correction codes in quantum computing.
  • The proposed method paves the way for more sophisticated fault-tolerant quantum architectures by bridging different code functionalities.