Quantum Mechanics
Cascaded Qubit Systems for Photon Statistics Analysis through Quantum Wave Mixing
This research develops a theoretical framework for quantum wave mixing (QWM) in a cascaded waveguide-QED system with two superconducting qubits. It demonstrates how suppressing the coherent Rayleigh component in the source spectrum allows the probe qubit’s dynamics to be described as being driven by…
Protocol for Constructing Quantum Hilbert-Space-Fragmented Hamiltonians
This paper introduces a systematic protocol for generating quantum Hilbert-space-fragmented Hamiltonians, distinguishing them from classically fragmented models by their Krylov-sector structure being resolvable only in an entangled basis. The method utilizes a Rokhsar-Kivelson-type construction, app…
Topological Robustness Limits Quantum State Representations
Representing quantum system states using outcome probabilities of measurements presents an inherent conflict. To maintain operational meaningfulness, the mapping from a quantum state to its probability representation must exhibit topological robustness. However, this robustness prevents the simultan…
Practical Road-map for Measurement-Altered Criticality in Rydberg Atom Chains
This paper proposes a practical experimental scheme to demonstrate measurement-altered criticality in Rydberg atom chains, specifically at Ising and tricritical Ising phase transitions. The method involves projectively measuring a periodic subset of atoms, which is shown to distinctly alter quantum …
Everettian Relative States in Heisenberg Picture Reveal Locality and Approximative Nature of Quantum Multiplicity
This paper successfully re-expresses Everett's relative-state construction within the Heisenberg picture, addressing previous conceptual and technical challenges. This new formulation explicitly demonstrates the local and approximative characteristics of Everettian multiplicity, attributing them to …