Input-output theory for spin-photon coupling in Si double quantum dots

Abstract

The interaction of qubits via microwave frequency photons enables long-distance qubit-qubit coupling and facilitates the realization of a large-scale quantum processor. However, qubits based on electron spins in semiconductor quantum dots have proven challenging to couple to microwave photons. In this theoretical work we show that a sizable coupling for a single electron spin is possible via spin-charge hybridization using a magnetic field gradient in a silicon double quantum dot. Based on parameters already shown in recent experiments, we predict optimal working points to achieve a coherent spin-photon coupling, an essential ingredient for the generation of long-range entanglement. Furthermore, we employ input-output theory to identify observable signatures of spin-photon coupling in the cavity output field, which may provide guidance to the experimental search for strong coupling in such spin-photon systems and opens the way to cavity-based readout of the spin qubit.

References in corpus (16)

• Surface codes: Towards practical large-scale quantum computation
• Coupling Superconducting Qubits via a Cavity Bus
• Coherent quantum state storage and transfer between two phase qubits via a resonant cavity
• Detecting arbitrary quantum errors via stabilizer measurements on a sublattice of the surface code
• Strong Coupling of a Single Electron in Silicon to a Microwave Photon
• Scalable gate architecture for densely packed semiconductor spin qubits
• Strong Coupling Cavity QED with Gate-Defined Double Quantum Dots Enabled by a High Impedance Resonator
• Spin dynamics in InAs-nanowire quantum-dots coupled to a transmission line
• Strong coupling of a spin qubit to a superconducting stripline cavity
• Microwave-driven coherent operations of a semiconductor quantum dot charge qubit
• Ultra-long distance interaction between spin qubits
• A Reconfigurable Gate Architecture for Si/SiGe Quantum Dots
• Electron Spin Resonance at the Level of 10000 Spins Using Low Impedance Superconducting Resonators
• Measurement of valley splitting in high-symmetry Si/SiGe quantum dots
• Circuit Quantum Electrodynamics Architecture for Gate-Defined Quantum Dots in Silicon
• Dispersive readout of valley splittings in cavity-coupled silicon quantum dots