Signal processing techniques for efficient compilation of controlled rotations in trapped ions

Abstract

Quantum logic gates with many control qubits are essential in many quantum algorithms, but remain challenging to perform in current experiments. Trapped ion quantum computers natively feature a different type of entangling operation, namely the Molmer-Sorensen (MS) gate which effectively applies an Ising interaction to all qubits at the same time. We consider a sequence of equal all-to-all MS operations, interleaved with single qubit gates that act only on one special qubit. Using a connection with quantum signal processing techniques, we find that it is possible to perform an arbitray SU(2) rotation on the special qubit if and only if all other qubits are in the state |1>. Such controlled rotation gates with N-1 control qubits require 2N applications of the MS gate, and can be mapped to a conventional Toffoli gate by demoting a single qubit to ancilla.

arXiv comment14 pages, 3 figures, comments welcome. v3 includes several fixes and adds an appendix with explicit angles

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• A high-fidelity method for a single-step $N$-bit Toffoli gate in trapped ions
• Efficient quantum programming using EASE gates on a trapped-ion quantum computer
• Constant-depth circuits for Boolean functions and quantum memory devices using multi-qubit gates
• Multi-Mode Global Driving of Trapped Ions for Quantum Circuit Synthesis
• Improved Strategies for Fermionic Quantum Simulation with Global Interactions