RealFeedApp Purity remains close to one when x is resolved
Discrete photon-number treatment reveals coherence remains unsuppressed in the strong-LO regime, contradicting continuum formulas. Remote state purity is preserved when parameter x is resolved but degrades when x is not recorded.
- Field
- hardware and chips
- What they did
- Researchers analyzed catodyne measurement methods using a Schrödinger cat state as a local oscillator, comparing two data processing approaches: the continuum approximation and exact discrete photon-number treatment.
- Why it matters
- The exact discrete description shows that in the strong local oscillator regime, coherence is not suppressed by the window, whereas continuum formulas erroneously predict its reduction, especially for narrow windows.
#quantum computing#cat states#coherence#photon-number#continuum approximation
