6 papers
Beyond Unitary Quantum Simulation: Open-System Approaches to Quantum Chemistry toward Quantum Advantage
Michael Marthaler, Elias Zapusek, Florentin Reiter
Quantum simulation is widely regarded as one of the most promising routes to genuine quantum advantage, yet most existing approaches to quantum chemistry are formulated in terms of…
Quantum Fanout Gates in Constant Depth via Resonance Engineering
Johannes Alexander Jaeger, Elias Zapusek, Florentin Reiter
We present a novel implementation of an n-qubit fanout gate using resonance engineering. Our proposed mechanism uses Jaynes-Cummings interactions between multiple qubits and a comm…
Scalable dissipative quantum error correction for qubit codes
Ivan Rojkov, Elias Zapusek, Florentin Reiter
Dissipative quantum error correction (QEC) autonomously protects quantum information using engineered dissipation and offers a promising alternative to error correction via measure…
Stabilization of cat-state manifolds using nonlinear reservoir engineering
Ivan Rojkov, Matteo Simoni, Elias Zapusek +2
We introduce a novel reservoir engineering approach for stabilizing multi-component Schrödinger's cat manifolds. The fundamental principle of the method lies in the destructive in…
Scaling Quantum Algorithms via Dissipation: Avoiding Barren Plateaus
Elias Zapusek, Ivan Rojkov, Florentin Reiter
Variational quantum algorithms (VQAs) have enabled a wide range of applications on near-term quantum devices. However, their scalability is fundamentally limited by barren plateaus…
Variational quantum thermalizers based on weakly-symmetric nonunitary multi-qubit operations
Elias Zapusek, Kristina Kirova, Walter Hahn +2
We propose incorporating multi-qubit nonunitary operations in Variational Quantum Thermalizers (VQTs). VQTs are hybrid quantum-classical algorithms that generate the thermal (Gibbs…