Verifiable blind quantum computing with trapped ions and single photons
Physical Review Letters American Physical Society 132:15 (2024) 150604
Abstract:
We report the first hybrid matter-photon implementation of verifiable blind quantum computing. We use a trapped-ion quantum server and a client-side photonic detection system networked via a fiber-optic quantum link. The availability of memory qubits and deterministic entangling gates enables interactive protocols without postselection—key requirements for any scalable blind server, which previous realizations could not provide. We quantify the privacy at ≲0.03 leaked classical bits per qubit. This experiment demonstrates a path to fully verified quantum computing in the cloud.
Fast, High-Fidelity Addressed Single-Qubit Gates Using Efficient Composite Pulse Sequences
Physical Review Letters American Physical Society (APS) 131:12 (2023) 120601
Entanglement-Enhanced Frequency Comparison of Two Optical Atomic Clocks
Institute of Electrical and Electronics Engineers (IEEE) 00 (2023) 1-1
Robust quantum memory in a trapped-ion quantum network node
Physical Review Letters American Physical Society 130 (2023) 090803
Abstract:
We integrate a long-lived memory qubit into a mixed-species trapped-ion quantum network node. Ion-photon entanglement first generated with a network qubit in 88Sr+ is transferred to 43Ca+ with 0.977(7) fidelity, and mapped to a robust memory qubit. We then entangle the network qubit with another photon, which does not affect the memory qubit. We perform quantum state tomography to show that the fidelity of ion-photon entanglement decays ∼ 70 times slower on the memory qubit. Dynamical decoupling further extends the storage time; we measure an ion-photon entanglement fidelity of 0.81(4) after 10 s.Sinara and ARTIQ: Open-Source Ion-Trapping Control System
Institute of Electrical and Electronics Engineers (IEEE) 02 (2023) 294-295