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Quantum Computing with Majorana Kramers Pairs.

Constantin Schrade1,2, Liang Fu1

  • 1Department of Physics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|December 9, 2022
PubMed
Summary
This summary is machine-generated.

We introduce a Majorana Kramers qubit, a novel quantum bit utilizing Majorana Kramers pairs. This design offers enhanced protection against errors, potentially leading to longer coherence times for quantum computing.

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Area of Science:

  • Quantum computing
  • Condensed matter physics
  • Topological superconductivity

Background:

  • Topological superconductors host Majorana fermions, which are promising for fault-tolerant quantum computation.
  • Existing Majorana qubit designs face challenges like quasiparticle poisoning and decoherence.

Purpose of the Study:

  • To propose a novel qubit design, the Majorana Kramers qubit, based on Majorana Kramers pairs.
  • To demonstrate a universal gate set for this qubit using all-superconducting components.
  • To enhance qubit robustness against environmental noise and thermal excitations.

Main Methods:

  • Utilizing degenerate ground states of a Coulomb-blockaded topological superconductor island.
  • Implementing gate operations via coupling Majorana Kramers pairs to superconducting leads.
  • Leveraging the energy gap of superconducting leads for quasiparticle poisoning protection.

Main Results:

  • A universal gate set for the Majorana Kramers qubit is proposed.
  • The design offers protection from quasiparticle poisoning through superconducting lead energy gaps.
  • The absence of strong magnetic fields enhances robustness against thermal excitations.

Conclusions:

  • The Majorana Kramers qubit presents a robust platform for quantum information processing.
  • This design offers potential for prolonged coherence times.
  • It provides a promising alternative route towards building a Majorana-based quantum computer.