Majorana signatures in charge transport through a topological superconducting double-island system

Abstract

We investigate the dynamics of a charge qubit consisting of two Coulomb-blockaded islands hosting Majorana zero modes. The frequency of the qubit is determined by coherent single-electron tunneling between two islands originating from the hybridization of two Majorana zero modes localized at the junction. We calculate the sequential tunneling current $I$ through the double-island device coupled to normal metal leads. We demonstrate that the $I-V$ characteristics in the large-bias regime can be used as a measurement of the coherent Majorana coupling $E_M$. We propose dc and ac transport experiments for measuring $E_M$, and discuss their limitations due to intrinsic dephasing mechanisms such as excited quasiparticles.

6+4 pages, 1+1 figures. v2: added references, accepted in PRB

References in corpus (9)

• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Majorana qubit decoherence by quasiparticle poisoning
• Majorana box qubits
• Braiding without Braiding: Teleportation-Based Quantum Information Processing with Majorana Zero Modes
• Kinetics of non-equilibrium quasiparticle tunneling in superconducting charge qubits
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Cited by in corpus (8)

• A perspective on semiconductor-based superconducting qubits
• Spin-resolved thermal signatures of Majorana-Kondo interplay in double quantum dots
• Electron correlation effects in superconducting nanowires in and out of equilibrium
• Master equation approach for transport through Majorana zero modes
• Implementation of single-qubit gates via parametric modulation in the Majorana transmon
• Fate of the superconducting state in floating islands of hybrid nanowire devices
• Majorana bound state parity exchanges in planar Josephson junctions
• Josephson radiation patterns in underdamped topological Josephson junctions