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Researchers developed a quantum phase battery using a hybrid superconducting circuit. This device stores and provides a persistent phase bias, crucial for advancing quantum technologies and phase coherence.

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Area of Science:

  • Quantum Computing
  • Condensed Matter Physics
  • Materials Science

Background:

  • Classical batteries provide voltage bias for electronic circuits.
  • Phase batteries are quantum devices offering persistent phase bias for quantum circuits.
  • Phase coherence is fundamental for quantum technologies.

Purpose of the Study:

  • To demonstrate a functional phase battery in a hybrid superconducting circuit.
  • To investigate the conversion of spin polarization into a persistent phase bias.
  • To explore the tuning and control of this quantum phase battery.

Main Methods:

  • Fabrication of a hybrid superconducting circuit using an n-doped InAs nanowire proximitized by Al superconducting leads.
  • Utilizing unpaired-spin surface states within the nanowire.
  • Applying an external in-plane magnetic field for tuning.

Main Results:

  • Efficient conversion of ferromagnetic polarization into a persistent phase bias (φ₀).
  • Observation of the anomalous Josephson effect due to the persistent phase bias.
  • Continuous tuning of the phase bias by an external magnetic field, enabling charging and discharging.
  • Experimental results align with theoretical predictions regarding symmetries in a vectorial magnetic field.

Conclusions:

  • The hybrid superconducting circuit successfully functions as a quantum phase battery.
  • The interplay of spin-orbit coupling and exchange interaction creates strong coupling between charge, spin, and superconducting phase.
  • This coupling can overcome phase rigidity, paving the way for novel quantum devices.