Efficient Long-Range Entanglement using Dynamic Circuits with Elisa Bäumer

Описание: Episode 153

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 In principle, these limitations can be superseded by non-unitary, dynamic circuits.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.

Elisa Bäumer is a research scientist at IBM Research - Zurich, where she currently explores different applications of dynamic circuits, with a focus on the creation of long-range entanglement. She received her PhD in quantum information theory from ETH in 2022. Next to her research, she is engaged in outreach activities such as providing lectures and hands-on workshops for students, developers and researchers with various backgrounds.