Coherent control and spectroscopy of a semiconductor quantum dot Wigner molecule

Abstract

Multi-electron semiconductor quantum dots have found wide application in qubits, where they enable readout and enhance polarizability. However, coherent control in such dots has typically been restricted to only the lowest two levels, and such control in the strongly interacting regime has not been realized. Here we report quantum control of eight different resonances in a silicon-based quantum dot. We use qubit readout to perform spectroscopy, revealing a dense set of energy levels with characteristic spacing far smaller than the single-particle energy. By comparing with full configuration interaction calculations, we argue that the dense set of levels arises from Wigner-molecule physics.

References in corpus (11)

• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• Universal quantum logic in hot silicon qubits
• Scalable gate architecture for densely packed semiconductor spin qubits
• Full configuration interaction approach to the few-electron problem in artificial atoms
• Magnetic field dependence of valley splitting in realistic Si/SiGe quantum wells
• A molecular state of correlated electrons in a quantum dot
• Incipient Wigner Localization in Circular Quantum Dots
• Detuning Axis Pulsed Spectroscopy of Valley-Orbital States in Si/SiGe Quantum Dots
• Correlated electrons in optically-tunable quantum dots: Building an electron dimer molecule
• Signatures of Wigner Localization in Epitaxially Grown Nanowires
• Singlet-triplet relaxation in multivalley silicon single quantum dots

Cited by in corpus (30)

• Universal logic with encoded spin qubits in silicon
• SiGe quantum wells with oscillating Ge concentrations for quantum dot qubits
• Strong electron-electron interactions in Si/SiGe quantum dots
• Valley splittings in Si/SiGe quantum dots with a germanium spike in the silicon well
• Two-body Wigner molecularization in asymmetric quantum dot spin qubits
• Probing the Spatial Variation of the Inter-Valley Tunnel Coupling in a Silicon Triple Quantum Dot
• Strong hole-photon coupling in planar Ge for probing charge degree and strongly-correlated states
• Longitudinal coupling between a Si/SiGe quantum dot and an off-chip TiN resonator
• Molecular formations and spectra due to electron correlations in three-electron hybrid double-well qubits
• Theory of tunneling spectra for a few-electron bilayer graphene quantum dot
• Jellybean quantum dots in silicon for qubit coupling and on-chip quantum chemistry
• Spin dynamics in quantum dots on liquid helium
• Wigner molecules and hybrid qubits
• Quantum Wigner molecules in moiré materials
• Spin-orbit enhancement in Si/SiGe heterostructures with oscillating Ge concentration
• Non-reciprocal Pauli Spin Blockade in a Silicon Double Quantum Dot
• Wigner-molecule supercrystal in transition-metal dichalcogenide moiré superlattices: Lessons from the bottom-up approach
• Wigner molecules in phosphorene quantum dots
• Valleytronic full configuration-interaction approach: An application to the excitation spectra of Si double-dot qubits
• Wigner-molecularization-enabled dynamic nuclear field programming
• Charge-noise resilience of two-electron quantum dots in Si/SiGe heterostructures
• Crystal-field effects in the formation of Wigner-molecule supercrystals in moiré TMD superlattices
• Electronic Wigner-Molecule Polymeric Chains in Elongated Silicon Quantum Dots and Finite-Length Quantum Wires
• Graph-Theoretic Approach to Quantum Error Correction
• Latched readout for the quantum dot hybrid qubit
• Microscopic theory on magnetic-field-tuned sweet spot of exchange interactions in multielectron quantum-dot systems
• Single-shot latched readout of a quantum dot qubit using barrier gate pulsing
• True decoherence-free-subspace derived from a semiconductor double quantum dot Heisenberg spin-trimer
• Dressed basis sets for the modeling of exchange interactions in double quantum dots
• Inter- and intra-band Coulomb interactions between holes in silicon nanostructures