Dispersive readout of valley splittings in cavity-coupled silicon quantum dots

Abstract

The bandstructure of bulk silicon has a six-fold valley degeneracy. Strain in the Si/SiGe quantum well system partially lifts the valley degeneracy, but the materials factors that set the splitting of the two lowest lying valleys are still under intense investigation. We propose a method for accurately determining the valley splitting in Si/SiGe double quantum dots embedded into a superconducting microwave resonator. We show that low lying valley states in the double quantum dot energy level spectrum lead to readily observable features in the cavity transmission. These features generate a "fingerprint" of the microscopic energy level structure of a semiconductor double quantum dot, providing useful information on valley splittings and intervalley coupling rates.

8 pages, 4 figures

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• Hybrid superconductor-semiconductor systems for quantum technology
• Dispersive readout of adiabatic phases
• Photon statistics of a double quantum dot micromaser: Quantum treatment
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• Topology detection in cavity QED
• Level spectrum and charge relaxation in a silicon double quantum dot probed by dual-gate reflectometry
• Dispersive readout of a weakly coupled qubit via the parity-time-symmetric phase transition
• Dispersive readout of molecular spin qudits
• Controllable Single Cooper Pair Splitting in Hybrid Quantum Dot Systems
• Optimal control of a cavity-mediated iSWAP gate between silicon spin qubits
• Microwave-resonator-detected excited-state spectroscopy of a double quantum dot
• Valleytronic full configuration-interaction approach: An application to the excitation spectra of Si double-dot qubits
• Fingerprints of Qubit Noise in Transient Cavity Transmission
• Dipole coupling of a bilayer graphene quantum dot to a high-impedance microwave resonator
• Unified linear response theory of quantum electronic circuits
• Proposal for a cavity-induced measurement of the exchange coupling in quantum dots
• Theory of qubit noise characterization using the long-time cavity transmission
• Micromagnet-free operation of electron spin qubits in Si/Si${}_{1-x}$Ge${}_x$ vertical double quantum dots
• Towards Utilizing Scanning Gate Microscopy as a High-Resolution Probe of Valley Splitting in Si/SiGe Heterostructures
• Impact of the valley orbit coupling on exchange gate for spin qubits in silicon quantum dots
• Interplay of Pauli blockade with electron-photon coupling in quantum dots