Dr Christopher Ballance: Publications

Entanglement-Enhanced Frequency Comparison of Two Optical Atomic Clocks

Institute of Electrical and Electronics Engineers (IEEE) 00 (2023) 1-1

Authors:

BC Nichol, R Srinivas, DP Nadlinger, P Drmota, D Main, G Araneda, CJ Ballance, DM Lucas

How to wire a 1000-qubit trapped ion quantum computer

(2023)

Authors:

M Malinowski, DTC Allcock, CJ Ballance

Breaking the entangling gate speed limit for trapped-ion qubits using a phase-stable standing wave

(2023)

Authors:

S Saner, O Băzăvan, M Minder, P Drmota, DJ Webb, G Araneda, R Srinivas, DM Lucas, CJ Ballance

Verifiable blind quantum computing with trapped ions and single photons

(2023)

Authors:

P Drmota, DP Nadlinger, D Main, BC Nichol, EM Ainley, D Leichtle, A Mantri, E Kashefi, R Srinivas, G Araneda, CJ Ballance, DM Lucas

Robust quantum memory in a trapped-ion quantum network node

Physical Review Letters American Physical Society 130 (2023) 090803

Authors:

Peter Drmota, Dougal Main, David P Nadlinger, Bethan Nichol, Marius A Weber, Ellis M Ainley, Ayush Agrawal, Raghavendra Srinivas, Gabriel Araneda, Chris J Ballance, David Lucas

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.

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