Stability of Floquet Majorana Box Qubits - Kölner UniversitätsPublikationsServer

Matthies, Anne ORCID: 0000-0003-1155-1281, Park, Jinhong ORCID: 0000-0001-6710-1031, Berg, Erez and Rosch, Achim ORCID: 0000-0002-6586-5721 (2022). Stability of Floquet Majorana Box Qubits. Phys. Rev. Lett., 128 (12). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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DOI:10.1103/PhysRevLett.128.127702

Abstract

In one-dimensional topological superconductors driven periodically with the frequency omega, two types of topological edge modes may appear, the well-known Majorana zero mode and a Floquet Majorana mode located at the quasienergy PLANCK CONSTANT OVER TWO PI omega/2. We investigate two Josephson-coupled topological quantum wires in the presence of Coulomb interactions, forming a so-called Majorana box qubit. An oscillating gate voltage can induce Floquet Majorana modes in both wires. This allows for the encoding of three qubits in a sector with fixed electron parity. If such a system is prepared by increasing the amplitude of oscillations adiabatically, it is inherently unstable as interactions resonantly create quasiparticles. This can be avoided by using instead a protocol where the oscillation frequency is increased slowly. In this case, one can find a parameter regime where the system remains stable.

Item Type:

Journal Article

Creators:

Creators	Email	ORCID	ORCID Put Code
Matthies, Anne	UNSPECIFIED	orcid.org/0000-0003-1155-1281	UNSPECIFIED
Park, Jinhong	UNSPECIFIED	orcid.org/0000-0001-6710-1031	UNSPECIFIED
Berg, Erez	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Rosch, Achim	UNSPECIFIED	orcid.org/0000-0002-6586-5721	UNSPECIFIED