High-temperature operation of a silicon qubit

Abstract

This study alleviates the low operating temperature constraint of Si qubits. A qubit is a key element for quantum sensors, memories, and computers. Electron spin in Si is a promising qubit, as it allows both long coherence times and potential compatibility with current silicon technology. Si qubits have been implemented using gate-defined quantum dots or shallow impurities. However, operation of Si qubits has been restricted to milli-Kelvin temperatures, thus limiting the application of the quantum technology. In this study, we addressed a single deep impurity, having strong electron confinement of up to 0.3 eV, using single-electron tunnelling transport. We also achieved qubit operation at 5-10 K through a spin-blockade effect based on the tunnelling transport via two impurities. The deep impurity was implemented by tunnel field-effect transistors (TFETs) instead of conventional FETs. With further improvement in fabrication and controllability, this work presents the possibility of operating silicon spin qubits at elevated temperatures.

arXiv comment25 pages, 12 figures

References in corpus (16)

• Single-shot read-out of an individual electron spin in a quantum dot
• Driven coherent oscillations of a single electron spin in a quantum dot
• Silicon Quantum Electronics
• A Two Qubit Logic Gate in Silicon
• A programmable two-qubit quantum processor in silicon
• Interfacing spin qubits in quantum dots and donors - hot, dense and coherent
• A CMOS silicon spin qubit
• Quantum CNOT Gate for Spins in Silicon
• Franck-Condon blockade and giant Fano factors in transport through single molecules
• A Coherent Spin-Photon Interface in Silicon
• Strong spin-photon coupling in silicon
• Electric Dipole Induced Spin Resonance in Quantum Dots
• Single Spin Measurement using Single Electron Transistors to Probe Two Electron Systems
• Efficient multiqubit entanglement via a spin-bus
• Electron Paramagnetic Resonance of Boron Acceptors in Isotopically Purified Silicon
• The impact of nuclear spin dynamics on electron transport through donors