Efficient Long-Range Entanglement Using Dynamic Circuits

By Elisa Baumer, Vinay Tripathi, Derek S. Wang, Patrick Rall, Edward H. Chen, Swarnadeep Majumder, Alireza Seif, Z. Minev. PRX Quantum, 2023

145 citations recorded by the source corpus.

Quantum simulation traditionally relies on unitary dynamics, inherently imposing efficiency constraints on the generation of intricate entangled states. In principle, these limitations can be superseded by nonunitary, dynamic circuits. These circuits exploit measurements alongside conditional feed-forward operations, providing a promising approach for long-range entangling gates, higher effective connectivity of near-term hardware, and more efficient state preparations. Here, we explore the utility of shallow dynamic circuits for creating long-range entanglement on large-scale quantum devices. Specifically, we study two tasks: controlled- gate teleportation between up to 101 qubits by feeding forward 99 midcircuit measurement outcomes, and the preparation of Greenberger–Horne–Zeilinger states with genuine entanglement. In the former, we observe that dynamic circuits can outperform their unitary counterparts. In the latter, by tallying instructions of compiled quantum circuits, we provide an error budget detailing the obstacles that must be addressed to unlock the full potential of dynamic circuits. Looking forward, we expect dynamic circuits to be useful for generating long-range entanglement in the near term on large-scale quantum devices. Published by the American Physical Society 2024

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/a12a2d0acfc2d3b819c96821fbf4505488ca3e56

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Citations in the corpus

Challenges and opportunities in quantum optimization (2023, unknown): “…is evolving quickly, and Review article model-independent benchmarks are better suited for comparability and compatibility between different generations of hardware, enabling leverage of new features that might not have been available in earlier generations, such as dynamic quantum circuits 178 .”
Quantum computing with Qiskit (2024, methodology): “It was also used in a demonstration of fault-tolerant magic state preparation beyond break-even fidelity [42], and in a number of utility-scale papers comprised of up to 133-qubits and O (10 4 ) two-qubit entangling gates [21, 30, 39, 40, 59, 64, 65, 72, 78, 81, 82, 100, 101, 104].”