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Dynamic Cooper Pair Splitter.

Fredrik Brange1, Kacper Prech1,2, Christian Flindt1

  • 1Department of Applied Physics, Aalto University, 00076 Aalto, Finland.

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|December 22, 2021
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Summary
This summary is machine-generated.

This study introduces a dynamic Cooper pair splitter for noiseless, regular generation of spin-entangled electrons. This breakthrough overcomes noise limitations in current quantum technologies, enabling synchronized operations with entangled electrons.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Information Science
  • Spintronics

Background:

  • Cooper pair splitters are essential for generating spin-entangled electrons.
  • Current Cooper pair splitting processes are inherently random and noisy, limiting their application in synchronized quantum operations.
  • A need exists for controlled and reliable generation of entangled electrons.

Purpose of the Study:

  • To propose and analyze a dynamic Cooper pair splitter (CPS) capable of producing a noiseless and regular flow of spin-entangled electrons.
  • To overcome the limitations of random and noisy Cooper pair splitting.
  • To enable synchronized quantum operations using entangled electrons.

Main Methods:

  • A dynamic Cooper pair splitter (CPS) was designed, utilizing a superconductor coupled to quantum dots.
  • The energy levels of the quantum dots were dynamically tuned in and out of resonance to control the splitting process.
  • The regularity of the entangled electron flow was characterized by analyzing the g^{(2)} function of output currents and waiting time distributions.

Main Results:

  • Optimal operating conditions were identified for the dynamic CPS.
  • Under optimal conditions, exactly one Cooper pair is split per period of the external drive, resulting in a noiseless flow of entangled electrons.
  • The analysis confirmed the regularity and reduced noise in the generated spin-entangled electron flow.

Conclusions:

  • The proposed dynamic Cooper pair splitter (CPS) offers a viable solution for generating noiseless spin-entangled electrons.
  • The technology is feasible with current experimental capabilities.
  • This advancement paves the way for dynamic quantum information processing applications utilizing spin-entangled electrons.