Spin shuttling in a silicon double quantum dot

Abstract

The transport of quantum information between different nodes of a quantum device is among the challenging functionalities of a quantum processor. In the context of spin qubits, this requirement can be met by coherent electron spin shuttling between semiconductor quantum dots. Here we theoretically study a minimal version of spin shuttling between two quantum dots. To this end, we analyze the dynamics of an electron during a detuning sweep in a silicon double quantum dot (DQD) occupied by one electron. Possibilities and limitations of spin transport are investigated. Spin-orbit interaction and the Zeeman effect in an inhomogeneous magnetic field play an important role for spin shuttling and are included in our model. Interactions that couple the position, spin and valley degrees of freedom open a number of avoided crossings in the spectrum allowing for diabatic transitions and interfering paths. The outcomes of single and repeated spin shuttling protocols are explored by means of numerical simulations and an approximate analytical model based on the solution of the Landau--Zener problem. We find that a spin infidelity as low as $1-F_s\lesssim 0.002$ with a relatively fast level velocity of $\alpha =600\mu$eV/ns is feasible for optimal choices of parameters or by making use of constructive interference.

13 pages, 7 figures

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Cited by in corpus (22)

• Semiconductor Spin Qubits
• Nonadiabatic Landau-Zener-Stückelberg-Majorana transitions, dynamics, and interference
• Coherent spin qubit transport in silicon
• Conveyor-mode single-electron shuttling in Si/SiGe for a scalable quantum computing architecture
• A shuttling-based two-qubit logic gate for linking distant silicon quantum processors
• Blueprint of a scalable spin qubit shuttle device for coherent mid-range qubit transfer in disordered Si/SiGe/SiO${}_2$
• Multicore Quantum Computing
• Enhanced spin coherence while displacing electron in a 2D array of quantum dots
• Interplay of charge noise and coupling to phonons in adiabatic electron transfer between quantum dots
• Probing the Spatial Variation of the Inter-Valley Tunnel Coupling in a Silicon Triple Quantum Dot
• Effect of induced transition on the quantum entanglement and coherence in two-coupled double quantum dots system
• Switching between relaxation hotspots and coldspots in disordered spin qubits
• Thermal entanglement and quantum coherence of a single electron in a double quantum dot with Rashba Interaction
• Measurement of tunnel coupling in a Si double quantum dot based on charge sensing
• Control of dephasing in spin qubits during coherent transport in silicon
• Protecting coherence from the environment via Stark many-body localization in a Quantum-Dot Simulator
• Universal control of superexchange in linear triple quantum dots with an empty mediator
• Sign-switching of superexchange mediated by few electrons under non-uniform magnetic field
• Proposal for a cavity-induced measurement of the exchange coupling in quantum dots
• Two-qubit sweet spots for capacitively coupled exchange-only spin qubits
• Efficient electron transfer in quantum dot chains controlled by a cubic detuning profile via shortcuts to adiabaticity
• Electrically driven spin resonance with bichromatic driving