Fully tunable longitudinal spin-photon interactions in Si and Ge quantum dots

Abstract

Spin qubits in silicon and germanium quantum dots are promising platforms for quantum computing, but entangling spin qubits over micrometer distances remains a critical challenge. Current prototypical architectures maximize transversal interactions between qubits and microwave resonators, where the spin state is flipped by nearly resonant photons. However, these interactions cause back-action on the qubit, that yield unavoidable residual qubit-qubit couplings and significantly affect the gate fidelity. Strikingly, residual couplings vanish when spin-photon interactions are longitudinal and photons couple to the phase of the qubit. We show that large longitudinal interactions emerge naturally in state-of-the-art hole spin qubits. These interactions are fully tunable and can be parametrically modulated by external oscillating electric fields. We propose realistic protocols to measure these interactions and to implement fast and high-fidelity two-qubit entangling gates. These protocols work also at high temperatures, paving the way towards the implementation of large-scale quantum processors.

References in corpus (33)

• Quantum information processing with circuit quantum electrodynamics
• How to Enhance Dephasing Time in Superconducting Qubits
• Experimental Comparison of Two Quantum Computing Architectures
• Prospects for Spin-Based Quantum Computing
• Qubits made by advanced semiconductor manufacturing
• Quantum Low-Density Parity-Check Codes
• Dispersive regime of circuit QED: photon-dependent qubit dephasing and relaxation rates
• CMOS-based cryogenic control of silicon quantum circuits
• Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot
• Spin relaxation and decoherence of holes in quantum dots
• Scaling silicon-based quantum computing using CMOS technology: State-of-the-art, Challenges and Perspectives
• A hole spin qubit in a fin field-effect transistor above 4 kelvin
• Electric Dipole Spin Resonance for Heavy Holes in Quantum Dots
• A singlet triplet hole spin qubit in planar Ge
• Coherent spin-spin coupling mediated by virtual microwave photons
• Input-output theory for spin-photon coupling in Si double quantum dots
• Low-overhead fault-tolerant quantum computing using long-range connectivity
• Theory of electric dipole spin resonance in quantum dots: Mean field theory with Gaussian fluctuations and beyond
• Hole spin qubits in Si FinFETs with fully tunable spin-orbit coupling and sweet spots for charge noise
• Squeezed hole spin qubits in Ge quantum dots with ultrafast gates at low power
• Hybridization and spin decoherence in heavy-hole quantum dots
• Proof of finite surface code threshold for matching
• Simple model for electrical hole spin manipulation in semiconductor quantum dots: Impact of dot material and orientation
• Lightly-strained germanium quantum wells with hole mobility exceeding one million
• Hole Spin Qubits in Ge Nanowire Quantum Dots: Interplay of Orbital Magnetic Field, Strain, and Growth Direction
• First-principles hyperfine tensors for electrons and holes in GaAs and silicon
• Stamping single wall nanotubes for circuit quantum electrodynamics
• Long-range entanglement for spin qubits via quantum Hall edge modes
• Efficient entanglement of spin qubits mediated by a hot mechanical oscillator
• Modulated longitudinal gates on encoded spin-qubits via curvature couplings to a superconducting cavity
• Transmission lines and resonators based on quantum Hall plasmonics: electromagnetic field, attenuation and coupling to qubits
• Exchange interaction of hole-spin qubits in double quantum dots in highly anisotropic semiconductors
• Characterization of helical Luttinger liquids in microwave stepped-impedance edge resonators

Cited by in corpus (15)

• Strong coupling between a photon and a hole spin in silicon
• Recent advances in hole-spin qubits
• Hole spin driving by strain-induced spin-orbit interactions
• Hole spin manipulation in inhomogeneous and non-separable electric fields
• Tunable hole spin-photon interaction based on g-matrix modulation
• Quantum computing on magnetic racetracks with flying domain wall qubits
• Hole spin qubits in thin curved quantum wells
• Planar Josephson junctions in germanium: Effect of cubic spin-orbit interaction
• Enhanced orbital magnetic field effects in Ge hole nanowires
• Determination of spin-orbit interaction in semiconductor nanostructures via non-linear transport
• Modelling of spin decoherence in a Si hole qubit perturbed by a single charge fluctuator
• Theory of multi-dimensional quantum capacitance and its application to spin and charge discrimination in quantum-dot arrays
• Longitudinal coupling between electrically driven spin-qubits and a resonator
• Anomalous zero-field splitting for hole spin qubits in Si and Ge quantum dots
• Robust Oscillator-Mediated Phase Gates Driven by Low-Intensity Pulses