Automated Generation of Shuttling Sequences for a Linear Segmented Ion Trap Quantum Computer

Jonathan Durandau2, Janis Wagner1, Frédéric Mailhot2, Charles-Antoine Brunet2, Ferdinand Schmidt-Kaler1, Ulrich Poschinger1, and Yves Bérubé-Lauzière2

1QUANTUM, Institute of Physics, Johannes Gutenberg University, Staudingerweg 7, 55128 Mainz, Germany
2Institut Quantique and Département de génie électrique et de génie informatique, Université de Sherbrooke, Sherbrooke, Québec, J1K 2R1, Canada

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A promising approach for scaling-up trapped-ion quantum computer platforms is by storing multiple trapped-ion qubit sets ('ion crystals') in segmented microchip traps and to interconnect these via physical movement of the ions ('shuttling'). Already for realizing quantum circuits with moderate complexity, the design of suitable qubit assignments and shuttling schedules require automation. Here, we describe and test algorithms which address exactly these tasks. We describe an algorithm for fully automated generation of shuttling schedules, complying to constraints imposed by a given trap structure. Furthermore, we introduce different methods for initial qubit assignment and compare these for random circuit (of up to 20 qubits) and quantum Fourier transform-like circuits, and generalized Toffoli gates of up to 40 qubits each. We find that for quantum circuits which contain a fixed structure, advanced assignment algorithms can serve to reduce the shuttling overhead.

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[1] Daniel Schoenberger, Stefan Hillmich, Matthias Brandl, and Robert Wille, 2024 29th Asia and South Pacific Design Automation Conference (ASP-DAC) 127 (2024) ISBN:979-8-3503-9354-5.

[2] Fabian Kreppel, Christian Melzer, Diego Olvera Millán, Janis Wagner, Janine Hilder, Ulrich Poschinger, Ferdinand Schmidt-Kaler, and André Brinkmann, "Quantum Circuit Compiler for a Shuttling-Based Trapped-Ion Quantum Computer", Quantum 7, 1176 (2023).

[3] Paul V. Klimov, Andreas Bengtsson, Chris Quintana, Alexandre Bourassa, Sabrina Hong, Andrew Dunsworth, Kevin J. Satzinger, William P. Livingston, Volodymyr Sivak, Murphy Yuezhen Niu, Trond I. Andersen, Yaxing Zhang, Desmond Chik, Zijun Chen, Charles Neill, Catherine Erickson, Alejandro Grajales Dau, Anthony Megrant, Pedram Roushan, Alexander N. Korotkov, Julian Kelly, Vadim Smelyanskiy, Yu Chen, and Hartmut Neven, "Optimizing quantum gates towards the scale of logical qubits", Nature Communications 15 1, 2442 (2024).

[4] Naoto Sato, Tomonori Sekiguchi, Takeru Utsugi, and Hiroyuki Mizuno, "Generating Shuttling Procedures for Constrained Silicon Quantum Dot Array", arXiv:2401.14683, (2024).

The above citations are from Crossref's cited-by service (last updated successfully 2024-05-26 15:05:27) and SAO/NASA ADS (last updated successfully 2024-05-26 15:05:28). The list may be incomplete as not all publishers provide suitable and complete citation data.