A Josephson phase battery
- URL: http://arxiv.org/abs/2001.03393v2
- Date: Sat, 20 Jun 2020 06:18:26 GMT
- Title: A Josephson phase battery
- Authors: E. Strambini, A. Iorio, O. Durante, R. Citro, C. Sanz-Fern\'andez, C.
Guarcello, I. V. Tokatly, A. Braggio, M. Rocci, N. Ligato, V. Zannier, L.
Sorba, F.S. Bergeret, and F. Giazotto
- Abstract summary: A phase battery is a quantum equipment which provides a persistent phase bias to the wave function of a quantum circuit.
Here we report on the first experimental realization of a phase battery in a hybrid superconducting circuit.
This interplay opens avenues for topological quantum technologies, superconducting circuitry and advanced schemes of circuit quantum electrodynamics.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: A battery is a classical apparatus which converts a chemical reaction into a
persistent voltage bias able to power electronic circuits. Similarly, a phase
battery is a quantum equipment which provides a persistent phase bias to the
wave function of a quantum circuit. It represents a key element for quantum
technologies based on quantum coherence. Unlike the voltage batteries, a phase
battery has not been implemented so far, mainly because of the natural rigidity
of the quantum phase that, in typical quantum circuits, is imposed by the
parity and time-reversal symmetry constrains. Here we report on the first
experimental realization of a phase battery in a hybrid superconducting
circuit. It consists of an n-doped InAs nanowire with unpaired-spin surface
states and proximitized by Al superconducting leads. We find that the
ferromagnetic polarization of the unpaired-spin states is efficiently converted
into a persistent phase bias $\varphi_0$ across the wire, leading to the
anomalous Josephson effect. By applying an external in-plane magnetic field a
continuous tuning of $\varphi_0$ is achieved. This allows the charging and
discharging of the quantum phase battery and reveals the symmetries of the
anomalous Josephson effect predicted by our theoretical model. Our results
demonstrate how the combined action of spin-orbit coupling and exchange
interaction breaks the phase rigidity of the system inducing a strong coupling
between charge, spin and superconducting phase. This interplay opens avenues
for topological quantum technologies, superconducting circuitry and advanced
schemes of circuit quantum electrodynamics.}
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