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quant-ph2026
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…
quant-ph2025★ 1 cited
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…
quant-ph2020
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…