Kavli Affiliate: Giordano Scappucci
| First 5 Authors: Yuta Matsumoto, Maxim De Smet, Larysa Tryputen, Sander L. de Snoo, Sergey V. Amitonov
| Summary:
The scalability and power of quantum computing architectures depend
critically on high-fidelity operations and robust and flexible qubit
connectivity. In this respect, mobile qubits are particularly attractive as
they enable dynamic and reconfigurable qubit arrays. This approach allows
quantum processors to adapt their connectivity patterns during operation,
implement different quantum error correction codes on the same hardware, and
optimize resource utilization through dedicated functional zones for specific
operations like measurement or entanglement generation. Such flexibility also
relieves architectural constraints, as recently demonstrated in atomic systems
based on trapped ions and neutral atoms manipulated with optical tweezers. In
solid-state platforms, highly coherent shuttling of electron spins was recently
reported. A key outstanding question is whether it may be possible to perform
quantum gates directly on the mobile spins. In this work, we demonstrate
two-qubit operations between two electron spins carried towards each other in
separate traveling potential minima in a semiconductor device. We find that the
interaction strength is highly tunable by their spatial separation, achieving
an average two-qubit gate fidelity of about 99%. Additionally, we implement
conditional post-selected quantum state teleportation between spatially
separated qubits with an average gate fidelity of 87%, showcasing the
potential of mobile spin qubits for non-local quantum information processing.
We expect that operations on mobile qubits will become a universal feature of
future large-scale semiconductor quantum processors.
| Search Query: ArXiv Query: search_query=au:”Giordano Scappucci”&id_list=&start=0&max_results=3