• Abstract Quantum simulation algorithms often require numerous ancilla qubits and deep circuits, prohibitive for near-term hardware. • We introduce a framework for simulating quantum channels using ensembles of low-depth circuits in place of many-qubit dilations. • This naturally enables simulations of open systems, which we demonstrate by preparing damped many-qubit GHZ states on ibm_hanoi. • The technique further inspires two Hamiltonian simulation algorithms with gate counts that are asymptotically independent of the spectral precision target, reducing resource requirements by several orders of magnitude for a benchmark system. • Similar content being viewed by others Data availability Data for the GHZ state preparation results run on ibm_hanoi can be provided upon reasonable request. • Code availability The code used to generate Figs.
Article Summaries:
- A new framework for quantum simulation replaces deep, ancilla‑heavy circuits with ensembles of low‑depth unitaries, enabling efficient simulation of quantum channels and open‑system dynamics. The authors demonstrate the method by preparing damped many‑qubit GHZ states on IBM Hanoi, showing practical viability on current hardware. Building on this idea, they propose two Hamiltonian‑simulation algorithms whose gate counts become asymptotically independent of the spectral‑precision target, cutting resource requirements by several orders of magnitude for a benchmark system. The approach promises more scalable quantum simulations for near‑term devices.
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