Time Reversal Symmetry

Of the geometry of light

Making the physics of glass more transparent

Koun Shirai bridges conventional physics and nonequilibrium materials to provide robust thermodynamic description of glasses. He redefines equilibrium as energy extraction impact, allowing tools of thermodynamics to apply to glasses.

Physicists uncover evidence of two arrows of time emerging from the quantum realm

Researchers at the University of Surrey discovered evidence of opposing arrows of time emerging from quantum systems. The study suggests that time's arrow may not be fixed, and instead could flow in both forward and backward directions due to processes taking place at the quantum level.

Kagome breaks the rules at record breaking temperatures

Scientists at the Paul Scherrer Institute have found a quantum phenomenon known as time-reversal symmetry breaking occurring at the surface of the Kagome superconductor RbV₃Sb₅ at temperatures up to 175 K. This discovery sets a new record for the temperature at which this phenomenon is observed among Kagome systems.

USTC realizes time reversal through input-output indefiniteness

A research team from USTC has demonstrated the realization of time reversal through input-output indefiniteness in a photonic system, achieving a high success probability of 99.6%. This breakthrough shows significant advantages over traditional methods and opens up new possibilities for quantum information and photonic technologies.

Atomic dance gives rise to a magnet

Researchers at Rice University have discovered a way to transform a rare-earth crystal into a magnet by using chirality in phonons. Chirality, or the twisting of atoms' motion, breaks time-reversal symmetry and aligns electron spins, creating a magnetic effect.

Scientists demonstrate time reflection of electromagnetic waves in a groundbreaking experiment

Researchers at CUNY ASRC detail a breakthrough experiment in which they observed time reflections of electromagnetic signals in a tailored metamaterial. The effect causes a significant portion of the broadband signals to be instantaneously time reversed and frequency converted, forming a strange echo.

Physicists revealed spontaneous T-symmetry breaking and exceptional points in cavity QED

Researchers demonstrate spontaneous time-reversal symmetry breaking in a cavity quantum electrodynamics system using dipole interaction. Exceptional points are identified at critical thresholds, exhibiting robust dynamics and topological protection.

BaBar experiment confirms time asymmetry

Researchers observed a long-theorized exception to time reversal symmetry, finding certain particle types change into one another six times more often in one direction than the other. The BaBar experiment provided clear conditions for a direct measurement of time violation, confirming quantum field theory.