English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We analyze the quantum-state purity of heralded single photons produced fromfrequency-anti-correlated biphotons. We find that the quantum-state purity intime-frequency domain depends strongly on the response time uncertainty of thetrigger-photon detector that heralds the generation of its paired photon. Ifthe trigger response time is much shorter than the two-photon coherence time,the time-frequency quantum-state purity of heralded single photons approachesunity and the heralded single photon is in a nearly pure state. If the triggerresponse time is much longer than the two-photon coherence time, the heraldedphoton is then projected onto a mixed state. Making use of the time-frequencyentanglement, heralded single photons with a well-defined temporal wavefunction or a frequency superposition state can be produced and engineered.This time-frequency entanglement allows for shaping heralded single photonsthrough nonlocal spectral modulation.

Quantum-State Purity of Heralded Single Photons Produced from Frequency-Anti-Correlated Biphotons