Distant spin entanglement via fast and coherent electron shuttling

Abstract

In the quest for large-scale quantum computing, networked quantum computers offer a natural path towards scalability. Now that nearest neighbor entanglement has been demonstrated for electron spin qubits in semiconductors, on-chip long distance entanglement brings versatility to connect quantum core units. Here we realize the controlled and coherent transfer of a pair of entangled electron spins, and demonstrate their remote entanglement when separated by a distance of 6 microns. Driven by coherent spin rotations induced by the electron displacement, high-contrast spin quantum interferences are observed and are a signature of the preservation of the entanglement all along the displacement procedure. This work opens the route towards fast on-chip deterministic interconnection of remote quantum bits in semiconductor quantum circuits.

Main text of 7 pages with 4 figures. Supplementary information of 4 pages with 3 figures

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Cited by in corpus (47)

• Semiconductor Spin Qubits
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• Review of performance metrics of spin qubits in gated semiconducting nanostructures
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• 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
• Operating semiconductor quantum processors with hopping spins
• Blueprint of a scalable spin qubit shuttle device for coherent mid-range qubit transfer in disordered Si/SiGe/SiO${}_2$
• Multicore Quantum Computing
• Shuttling an electron spin through a silicon quantum dot array
• Si/SiGe QuBus for single electron information-processing devices with memory and micron-scale connectivity function
• Coherent spin qubit shuttling through germanium quantum dots
• Two-qubit logic between distant spins in silicon
• Gate-Controlled Quantum Dots Based on Two-Dimensional Materials
• Coulomb-mediated antibunching of an electron pair surfing on sound
• Interplay of charge noise and coupling to phonons in adiabatic electron transfer between quantum dots
• High-fidelity single-spin shuttling in silicon
• Generation of a single-cycle acoustic pulse: a scalable solution for transport in single-electron circuits
• Strategies for enhancing spin-shuttling fidelities in Si/SiGe quantum wells with random-alloy disorder
• In-flight distribution of an electron within a surface acoustic wave
• Dynamic strain modulation of a nanowire quantum dot compatible with a thin-film lithium niobate photonic platform
• Ultrashort electron wavepackets via frequency-comb synthesis
• Remotely pumped GHz antibunched emission from single exciton centers in GaAs
• Partial Landau-Zener transitions and applications to qubit shuttling
• Decoherence of electron spin qubit during transfer between two semiconductor quantum dots at low magnetic fields
• Fault-Tolerant Preparation of Quantum Polar Codes Encoding One Logical Qubit
• Controlled quantum dot array segmentation via a highly tunable interdot tunnel coupling
• Topological Spin Textures Enabling Quantum Transmission
• Semiconductor-based electron flying qubits: Review on recent progress accelerated by numerical modelling
• Reservoir-Free Decoherence in Flying Qubits
• Compiling the surface code to crossbar spin qubit architectures
• Sign-switching of superexchange mediated by few electrons under non-uniform magnetic field
• Factory-based Fault-tolerant Preparation of Quantum Polar Codes Encoding One logical Qubit
• Universal control of superexchange in linear triple quantum dots with an empty mediator
• Suppressing Si Valley Excitation and Valley-Induced Spin Dephasing for Long-Distance Shuttling
• Photosynthetic properties assisted by the quantum entanglement in two adjacent pigment molecules
• Hybrid acousto-optical swing-up state control in a quantum dot
• Electrical Interconnects for Silicon Spin Qubits
• Coulomb collisions of hot and cold single electrons in series-coupled silicon single-electron pumps
• On-Demand Single-Electron Source via Single-Cycle Acoustic Pulses
• Decoherence and fidelity enhancement during shuttling of entangled spin qubits
• Entangling nuclear spins in distant quantum dots via an electron bus
• Omnidirectional shuttling to avoid valley excitations in Si/SiGe quantum wells
• Compilation Techniques for Spin Qubits in a Shuttling Bus Architecture
• Numerical simulation of coherent spin-shuttling in a QuBus with charged defects
• Suppression of Electromagnetic Crosstalk by Differential Excitation for SAW Generation
• Long-distance coupling of spin qubits via topological magnons