Quantum capacitance with an auxiliary quantum dot measures ground-state energy splitting and Majorana overlap in topological qubits via peak positions and magnitudes in even and odd parity sectors.
Quantum capacitance and parity switching of a quantum-dot-based Kitaev chain
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abstract
An array of quantum dots coupled via superconductivity provides a new platform for creating Kitaev chains with Majorana zero modes, offering a promising avenue toward topological quantum computing. In this work, we theoretically study the quantum capacitance of a minimal Kitaev chain weakly coupled to an external normal lead. We find that in the open regime, charge stability diagrams of quantum capcaitance can help to identify the sweet spot of a Kitaev chain, consistent with tunnel spectroscopy. Moreover, the quantum capacitance of a single quantum dot coupled to Andreev bound states reveals the interplay between two distinct parity switching mechanisms: coupling to an external normal lead and intrinsic quasiparticle poisoning. Our work provides useful physical insights into the quantum capacitance and parity dynamics in a quantum-dot-based Kitaev chain device.
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cond-mat.mes-hall 1years
2026 1verdicts
UNVERDICTED 1representative citing papers
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Assessing Majorana states and qubits through quantum capacitance
Quantum capacitance with an auxiliary quantum dot measures ground-state energy splitting and Majorana overlap in topological qubits via peak positions and magnitudes in even and odd parity sectors.