Robust poor man's Majorana zero modes using Yu-Shiba-Rusinov states

Abstract

The recent realization of a two-site Kitaev chain featuring "poor man's Majorana" states demonstrates a path forward in the field of topological superconductivity. Harnessing the potential of these states for quantum information processing, however, requires increasing their robustness to external perturbations. Here, we form a two-site Kitaev chain using proximitized quantum dots hosting Yu-Shiba-Rusinov states. The strong hybridization between such states and the superconductor enables the creation of poor man's Majorana states with a gap larger than $70\mu \mathrm{eV}$. It also greatly reduces the charge dispersion compared to Kitaev chains made with non-proximitized quantum dots. The large gap and reduced sensitivity to charge fluctuations will benefit qubit manipulation and demonstration of non-abelian physics using poor man's Majorana states.

45 pages, 14 figures

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Cited by in corpus (46)

• Signatures of Majorana protection in a three-site Kitaev chain
• Observation of edge and bulk states in a three-site Kitaev chain
• From perfect to imperfect poor man's Majoranas in minimal Kitaev chains
• Non-Hermitian multiterminal phase-biased Josephson junctions
• Majorana quasiparticles in atomic spin chains on superconductors
• Flux-tunable Kitaev chain in a quantum dot array
• Quantum-dot-based Kitaev chains: Majorana quality measures and scaling with increasing chain length
• Rabi and Ramsey oscillations of a Majorana qubit in a quantum dot-superconductor array
• Fate of poor man's Majoranas in the long Kitaev chain limit
• Interplay between Majorana and Shiba states in a minimal Kitaev chain coupled to a superconductor
• Majorana modes in quantum dots coupled via a floating superconducting island
• Non-Hermitian minimal Kitaev chains
• Majorana sweet spots in 3-site Kitaev chains
• Supercurrent through an Andreev trimer
• 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
• Subgap states in semiconductor-superconductor devices for quantum technologies: Andreev qubits and minimal Majorana chains
• A flux-controlled two-site Kitaev chain
• Topological Modes in Monitored Quantum Dynamics
• Unified model for non-Abelian braiding of Majorana and Dirac fermion zero modes
• Braiding Majoranas in a linear quantum dot-superconductor array: Mitigating the errors from Coulomb repulsion and residual tunneling
• YSR Bond Qubit in a Double Quantum Dot with cQED Operation
• Phase-controlled minimal Kitaev chain in multiterminal Josephson junctions
• Nonlocal Josephson diode effect in minimal Kitaev chains
• Topological Computation by non-Abelian Braiding in Classical Metamaterials
• Josephson diode effect in nanowire-based Andreev molecules
• Side-gate modulation of supercurrent in InSb nanoflag-based Josephson junctions
• Shuttling Majorana zero modes in disordered and noisy topological superconductors
• Properties and prevalence of false poor man's Majoranas in two- and three-site artificial Kitaev chains
• Gapfull and gapless $1$D Topological Superconductivity in Spin-Orbit Coupled Bilayer Graphene
• Temperature dependent energy gap for Yu-Shiba-Rusinov states at the quantum phase transition
• Nonreciprocal Equilibrium Josephson Effect of Arbitrary Periodicity from Poor Man's Majorana Zero Modes
• The Josephson effect in Fibonacci superconductors
• Dynamics of Majorana zero modes across hybrid Kitaev chain
• Revisiting the Poor Man's Majoranas: The Spin-Exchange Induced Spillover Effect
• Quantifying robustness and locality of Majorana bound states in interacting systems
• Probing the Design Space of InSb Topological Superconductor Nanowires for the Realization of Majorana Zero Modes
• Cavity Control of Topological Qubits: Fusion Rule, Anyon Braiding, and Majorana-Schrödinger Cat States
• Determination of the current-phase relation of an InAs 2DEG Josephson junction with a microwave resonator
• Quantum capacitance and parity switching of a quantum-dot-based Kitaev chain
• Topological superconducting phase in a non-Hermitian Kitaev chain with staggered pairing imbalance
• Entanglement dynamics in minimal Kitaev chains
• Optimal Majoranas in Mesoscopic Kitaev Chains
• Fluctuation response of a minimal Kitaev chain in nonequilibrium states
• Scaling of Quantum Geometry Near the Non-Hermitian Topological Phase Transitions
• Distinguishing Majorana bound states from accidental zero-energy modes with a microwave cavity