Silicon quantum processor with robust long-distance qubit couplings

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Abstract

Practical quantum computers require a large network of highly coherent qubits, interconnected in a design robust against errors. Donor spins in silicon provide state-of-the-art coherence and quantum gate fidelities, in a platform adapted from industrial semiconductor processing. Here we present a scalable design for a silicon quantum processor that does not require precise donor placement and leaves ample space for the routing of interconnects and readout devices. We introduce the flip-flop qubit, a combination of the electron-nuclear spin states of a phosphorus donor that can be controlled by microwave electric fields. Two-qubit gates exploit a second-order electric dipole-dipole interaction, allowing selective coupling beyond the nearest-neighbor, at separations of hundreds of nanometers, while microwave resonators can extend the entanglement to macroscopic distances. We predict gate fidelities within fault-tolerance thresholds using realistic noise models. This design provides a realizable blueprint for scalable spin-based quantum computers in silicon.

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Tosi, G., Mohiyaddin, F. A., Schmitt, V., Tenberg, S., Rahman, R., Klimeck, G., & Morello, A. (2017). Silicon quantum processor with robust long-distance qubit couplings. Nature Communications, 8(1). https://doi.org/10.1038/s41467-017-00378-x

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