Quantum capacitance and parity switching of a quantum-dot-based Kitaev chain
arXiv:2601.20252 · doi:10.1103/tzjr-45sz
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.
8 pages and 4 figures
References in corpus (52)
- Non-Abelian Anyons and Topological Quantum Computation
- Unpaired Majorana fermions in quantum wires
- New directions in the pursuit of Majorana fermions in solid state systems
- Majorana Zero Modes and Topological Quantum Computation
- Scalable Designs for Quasiparticle-Poisoning-Protected Topological Quantum Computation with Majorana Zero Modes
- Evidence for crossed Andreev reflection in superconductor-ferromagnet hybrid structures
- Measurement-Only Topological Quantum Computation
- Realization of a minimal Kitaev chain in coupled quantum dots
- Majorana box qubits
- How to realize a robust practical Majorana chain in a quantum dot-superconductor linear array
- Parity qubits and poor man's Majorana bound states in double quantum dots
- Subtle leakage of a Majorana mode into a quantum dot
- Andreev Level Qubit
- Andreev quantum dots for spin manipulation
- Charge and spin state readout of a double quantum dot coupled to a resonator
- Singlet and triplet Cooper pair splitting in hybrid superconducting nanowires
- Cooper Pair Splitting by means of Graphene Quantum Dots
- Direct manipulation of a superconducting spin qubit strongly coupled to a transmon qubit
- Adaptive tuning of Majorana fermions in a quantum dot chain
- Tunable superconducting coupling of quantum dots via Andreev bound states in semiconductor-superconductor nanowires
- Superconducting Spin Qubits
- Interaction effects on a Majorana zero mode leaking into a quantum dot
- A two-site Kitaev chain in a two-dimensional electron gas
- Roadmap towards Majorana qubits and nonabelian physics in quantum dot-based minimal Kitaev chains
- Controlled crossed Andreev reflection and elastic co-tunneling mediated by Andreev bound states
- Andreev spin qubits in multichannel Rashba nanowires
- Robust poor man's Majorana zero modes using Yu-Shiba-Rusinov states
- Metal-Quantum Dot-Topological Superconductor Junction: Kondo correlations and Majorana Bound States
- Triplet correlations in Cooper pair splitters realized in a two-dimensional electron gas
- Coupling spin qubits via superconductors
- Crossed Andreev reflection and elastic co-tunneling in a three-site Kitaev chain nanowire device
- Probing Majorana localization in minimal Kitaev chains through a quantum dot
- Large dispersive interaction between a CMOS double quantum dot and microwave photons
- Fusion protocol for Majorana modes in coupled quantum dots
- Signatures of Majorana protection in a three-site Kitaev chain
- Enhancing the excitation gap of a quantum-dot-based Kitaev chain
- Observation of edge and bulk states in a three-site Kitaev chain
- Braiding-based quantum control of a Majorana qubit built from quantum dots
- Rapid microwave-only characterization and readout of quantum dots using multiplexed gigahertz-frequency resonators
- High-fidelity two-qubit gates of hybrid superconducting-semiconducting singlet-triplet qubits
- Kitaev chain in an alternating quantum dot-Andreev bound state array
- From perfect to imperfect poor man's Majoranas in minimal Kitaev chains
- Robustness of Majorana edge states of short-length Kitaev chains coupled with environment
- Rabi and Ramsey oscillations of a Majorana qubit in a quantum dot-superconductor array
- Flux-tunable Kitaev chain in a quantum dot array
- Variable and orbital-dependent spin-orbit field orientations in a InSb double quantum dot characterized via dispersive gate sensing
- Radio-frequency C-V measurements with sub-attofarad sensitivity
- Coupling of quantum-dot states via elastic-cotunneling and crossed Andreev reflection in a minimal Kitaev chain
- Majorana sweet spots in 3-site Kitaev chains
- Interaction-induced strong zero modes in short quantum dot chains with time-reversal symmetry
- Scaling up a sign-ordered Kitaev chain without magnetic flux control
- Braiding Majoranas in a linear quantum dot-superconductor array: Mitigating the errors from Coulomb repulsion and residual tunneling