The Utility Of Shallow Dynamic Circuits For Long-Range Entanglement On Large-Scale Quantum Devices


A technical paper titled “Efficient Long-Range Entanglement using Dynamic Circuits” was published by researchers at IBM Research, IBM T.J. Watson Research Center, University of Southern California, MIT-IBM Watson AI Lab, and IBM Quantum.


“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 In principle, these limitations can be superseded by non-unitary, dynamic circuits.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: CNOT gate teleportation between up to 101 qubits by feeding forward 99 mid-circuit measurement outcomes, and the preparation of Greenberger-Horne-Zeilinger (GHZ) 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.”

Find the technical paper here. Published August 2023 (preprint).

Bäumer, Elisa, Vinay Tripathi, Derek S. Wang, Patrick Rall, Edward H. Chen, Swarnadeep Majumder, Alireza Seif, and Zlatko K. Minev. “Efficient Long-Range Entanglement using Dynamic Circuits.” arXiv preprint arXiv:2308.13065 (2023).

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