The recently developed notion of parity–time (PT) symmetry in optical systems has spawned intriguing prospects. So far, most experimental implementations have been reported in solid-state systems. Here, we report the first experimental demonstration of optical anti-PT symmetry—the counterpart of ...
Anti-parity–time symmetry with flying atoms Parity-time symmetry in optics is studied in a warm atomic vapour, where its counterpart, anti-parity-time symmetry, as well as refractionless propagation, can also be observed. P Peng,W Cao,C Shen,... - 《Nature Physics》 被引量: 12发表: 20...
involving tailored nano-structured devices with controlled optical gain and loss. In this work, anti-parity-time symmetric phase transitions and exceptional point singularities are demonstrated in a single strand of single-mode telecommunication fibre, using a setup consisting of off-the-shelf components...
TDPE have jet nozzles with thrust vector control (TVC) in the lifting and running system (LRS) and front output of the longitudinal shafts from their turbines for power take-off via the clutch to the coaxial HB reducer mounted at the front on the flight from the centre of mass.;EFFECT:...
Given the urgency of the IS project, OKB-586 proposed an "intermediate" version of the space launcher, which would be based on the "ballistic" 8K67 version of the R-36 missile, which was already in production at the time. Unlike the orbital version, the 8K67 missile was equipped with ...
The social fabric appears to be unravelling: civility seems like an old-fashioned habit, honesty like an optional exercise and trust like the relic of another time. Some observers claim that “the process of our moral decline” began with the “sinking of the foundations of morality” and proc...
The other fundamental interactions of nature, described by a relativistic quantum field theory—the Standard Model of particle physics—also show complete symmetry between matter and antimatter systems as a consequence of the CPT (Charge, Parity, Time reversal) theorem. This CPT symmetry demands, in...
especially prominent in the news due to their use in the war in Ukraine by both sides. While we haven’t seen coordinated swarms being actively employed on the modern battlefield, it’s likely only a matter of time, making drone swarm defense an active field of development in the industry...
Dynamically encircling an exceptional point (EP) in parity-time (PT) symmetric waveguide systems exhibits interesting chiral dynamics that can be applied to asymmetric mode switching for symmetric and anti-symmetric modes. The counterpart symmetry-broken
Non-Hermitian Hamiltonians, satisfying parity-time (\({{{\mathcal{P}}}{{{\mathcal{T}}}\)) symmetry, can have real eigenvalues in the symmetry unbroken zone1,2,3. A \({{{\mathcal{P}}}{{{\mathcal{T}}}\)-symmetric Hamiltonian satisfies \([\hat{H},\hat{{{\mathcal{P}...