Charge sensing the parity of an Andreev molecule

Abstract

The proximity effect of superconductivity on confined states in semiconductors gives rise to various bound states such as Andreev bound states (ABSs), Andreev molecules and Majorana zero modes. While such bound states do not conserve charge, their Fermion parity is a good quantum number. One way to measure parity is to convert it to charge first, which is then sensed. In this work, we sense the charge of ABSs and Andreev molecules in an InSb-Al hybrid nanowire using an integrated quantum dot operated as a charge sensor. We show how charge sensing measurements can resolve the even and odd states of an Andreev molecule, without affecting the parity. Such an approach can be further utilized for parity measurements of Majorana zero modes in Kitaev chains based on quantum dots.

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Cited by in corpus (6)

• Fermion-parity qubit in a proximitized double quantum dot
• Many-body quantum dynamics of spin-orbit coupled Andreev states in a Zeeman field
• Exploring the energy spectrum of a four-terminal Josephson junction: Towards topological Andreev band structures
• Fermionic Quantum Simulation on Andreev Bound State Superlattices
• Properties of multiterminal superconducting nanostructure with double quantum dot
• Transient triplet blockade in Andreev junction