This research proposal presents an experimental design to verify parity erasure in photonic quantum systems, leveraging the Hong-Ou-Mandel effect and photon-number parity measurements. The study proposes three verification protocols and suggests that with current technology, visibility exceeding 95% can be achieved, enabling clear discrimination between parity-preserving and parity-erased quantum channels.
Key findings
Parity erasure characterizes processes with indefinite causal order in quantum mechanics.
The Hong-Ou-Mandel effect is sensitive to the parity of input states, affecting quantum interference.
Three distinct verification protocols are proposed: direct parity erasure, quantum erasure with delayed choice, and entanglement-assisted parity verification.
Achieving visibility over 95% can discriminate between parity-preserving and parity-erased quantum channels.
Limitations & open questions
The experimental challenges include the need for photon-number-resolving detection and precise control over quantum optical interference.