Science, Space and Technology News 2024
Spin qubits go trampolining to make quantum gates and couple to other spin qubits on the chip. Credit: Studio Oostrum for QuTech
Over twenty years after Loss and DiVincenzo’s proposal for quantum computation with quantum dots, QuTech researchers have realized these concepts using germanium to facilitate spin control. This approach simplifies the electronics needed forIn 1998, Loss and DiVincenzo published the seminal work ‘quantum computation with quantum dots’. In their original work, hopping of spins was proposed as a basis for qubit logic, but an experimental implementation has remained lacking.
When considering the difference between hopping and somersaulting qubits, think of quantum dot arrays as a trampoline park, where electron spins are like people jumping. Typically, each person has a dedicated trampoline, but they can hop over to neighboring trampolines if available. Germanium has a unique property: just by jumping from one trampoline to the next, a person experiences a torque that makes them somersault. This property allows researchers to control the qubits effectively.
Different trampolines make people experience different torques when jumping, and similarly, hopping spins between quantum dots also result in unique rotations. It is thus important to characterize and understand the variability. Co-author Francesco Borsoi adds: “We established control routines that enables to hop spins to any quantum dot in a 10-quantum dot array, which allows us to probe key qubit metrics in extended systems.
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