Synthesis Of And Compilation With Time-optimal Multi-qubit Gates

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Pascal Baßler¹, Matthias Zipper¹, Christopher Cedzich¹, Markus Heinrich¹, Patrick H. Huber², Michael Johanning², and Martin Kliesch^1,3

¹Institute for Theoretical Physics, Heinrich-Heine-Universität Düsseldorf, Germany
²Department of Physics, School of Science and Technology, University of Siegen, Germany
³Institute for Quantum and Quantum Inspired Computing, Hamburg University of Technology, Germany

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Abstract

We develop a method to synthesize a class of entangling multi-qubit gates for a quantum computing platform with fixed Ising-type interaction with all-to-all connectivity. The only requirement on the flexibility of the interaction is that it can be switched on and off for individual qubits. Our method yields a time-optimal implementation of the multi-qubit gates. We numerically demonstrate that the total multi-qubit gate time scales approximately linear in the number of qubits. Using this gate synthesis as a subroutine, we provide compilation strategies for important use cases: (i) we show that any Clifford circuit on $n$ qubits can be implemented using at most $2n$ multi-qubit gates without requiring ancilla qubits, (ii) we decompose the quantum Fourier transform in a similar fashion, (iii) we compile a simulation of molecular dynamics, and (iv) we propose a method for the compilation of diagonal unitaries with time-optimal multi-qubit gates, as a step towards general unitaries. As motivation, we provide a detailed discussion on a microwave controlled ion trap architecture with magnetic gradient induced coupling (MAGIC) for the generation of the Ising-type interactions.

Popular summary

To run a program on any computing platform, it is necessary to decompose its higher-level logical operations into more elementary ones, and eventually translate those into the native instruction set of the platform at hand. In this top-down approach this process is called compiling. It is not only crucial for classical, but also quantum computation. Complementary to a general compilation process, it is often useful to start with the native instruction set to develop dedicated constructions for particularly useful quantum gates –a process called gate synthesis– which can then be used for compiling. The performance of compiling and gate synthesis depends severely on the available interactions on the quantum computing platform and the extent to which they can be controlled.

In this work, we synthesize a class of multi-qubit quantum gates on a platform that satisfies the following abstract requirements:
(I) parallel execution of single-qubit rotations, and
(II) Ising interactions with all-to-all connectivity.
For the compilation strategies with these gates we additionally require that
(III) certain qubits can be excluded from the participation in the interaction.
These requirements are met by many platforms such as ion traps and superconducting qubits and provide multi-qubit entangling.
We synthesize time-optimal multi-qubit gates from sequences of Ising interactions with different qubit encodings during suitable time steps.

Using our gate synthesis as a subroutine, we provide compilation strategies for important use cases which include – but are not limited to – the simulation of molecular dynamics, the quantum Fourier transform, and Clifford circuits. The latter two are ubiquitous in important quantum algorithms like the Shor’s algorithm for integer factoring and play an important role in the characterization of quantum computing platforms, e.g., via randomized benchmarking.

► BibTeX data

@article{Bassler2023synthesisof, doi = {10.22331/q-2023-04-20-984}, url = {https://doi.org/10.22331/q-2023-04-20-984}, title = {Synthesis of and compilation with time-optimal multi-qubit gates}, author = {Ba{ss{}}ler, Pascal and Zipper, Matthias and Cedzich, Christopher and Heinrich, Markus and Huber, Patrick H. and Johanning, Michael and Kliesch, Martin}, journal = {{Quantum}}, issn = {2521-327X}, publisher = {{Verein zur F{“{o}}rderung des Open Access Publizierens in den Quantenwissenschaften}}, volume = {7}, pages = {984}, month = apr, year = {2023}<br /> }

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Cited by

[1] Sergey Bravyi, Dmitri Maslov, and Yunseong Nam, “Constant-Cost Implementations of Clifford Operations and Multiply-Controlled Gates Using Global Interactions”, Physical Review Letters 129 23, 230501 (2022).

[2] Anette Messinger, Michael Fellner, and Wolfgang Lechner, “Constant Depth Code Deformations in the Parity Architecture”, arXiv:2303.08602, (2023).

The above citations are from SAO/NASA ADS (last updated successfully 2023-04-20 12:13:05). The list may be incomplete as not all publishers provide suitable and complete citation data.

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Synthesis of and compilation with time-optimal multi-qubit gates

Republished By Plato

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