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55 papers
Strictly Localized Mixed States
Sigurd Sørlie Rustad, Jan Gulla, Johannes Skaar
We study strictly localized mixed states in quantum field theory: states that are indistinguishable from vacuum outside some spacetime region. Such states are generated from the va…
A truncated photon
Isak Cecil Onsager Rukan, Jan Gulla, Johannes Skaar
An elementary particle such as a photon cannot be cut in two pieces. Still it must be possible to truncate a photon with an optical shutter. The result is neither another photon no…
Tunneling times of single photons
Jan Gulla, Johannes Skaar
Although the group delay of classical pulses through a barrier may suggest superluminality, the information transfer is limited by the precursor which propagates at the vacuum ligh…
Strictly localized three-dimensional states close to single photons
Kai Ryen, Jan Gulla, Johannes Skaar
A class of strictly localized states which can be made arbitrarily close to single photons is constructed, and expressions for central properties are provided. It is demonstrated t…
Limits for realizing single photons
Jan Gulla, Kai Ryen, Johannes Skaar
Exact single photons cannot be generated on demand due to their infinite tails. To quantify how close realizable optical states can be to some target single photon in one dimension…
Approaching single-photon pulses
Jan Gulla, Johannes Skaar
Single-photon pulses cannot be generated on demand, due to incompatible requirements of positive frequencies and positive times. Resulting states therefore contain small probabilit…