Crystal chain: Artist’s impression of the discrete time crystal made at QuTech. A chain of connected spins is locked in a phase in which they periodically invert their state. (Courtesy: Joe Randall and Tim Tam
Before long, astute observers spotted distinct similarities between discrete time crystals in quantum systems and so-called parametric resonators, a concept in classical physics reaching back to work by Michael Faraday in 1831. The connection between these two bodies of work remained, however, opaque....
intriguing type of quantum system known as a discrete time crystal (DTC). Whereas normal, material crystals display a fixed-dimensional periodicity in their structure, DTCs repeat their properties in time, with cycles that have an integer multiple of the period of the force that causes the ...
Spontaneous emission from GaAs/AlGaAs quantum dots (QDs) embedded in photonic crystals with a narrow photonic band gap is studied theoretically. The results show that the decay lifetime is very sensitive to the sizes of QDs, and both inhibited and accelerated emission can occur, which had been ...
we analyze theoretically and experimentally the PINEM discrete sideband spectrum (some recent work can be found, e.g., in2,3,10, but they only addressed the case of coherent light) as well as the DLA acceleration spectrum and show that their spectrum implies the wave-particle duality of free...
Polariton lasers emit coherent monochromatic light through a spontaneous emission process. As a rare example of a system in which Bose–Einstein condensation and superfluidity are reported at room temperature, polariton lasers are interesting for fundame
One might hope to use two of the energy levels as a qubit: if the pendulum were in its lowest-energy level, the qubit would be in its 0 state; and the next-highest level would represent the 1 state. A bit—a basic unit of classical information—has 0 and 1 states. A qubit can ...
2023, Nanoelectronics : Physics, Materials and DevicesAbhigyan Ganguly, Rupam Goswami Chapter Perovskite quantum dots 7.3.1 Perovskite quantum well Quantum well is a potential well with discrete energy values. According to classical theory, the particles are initially free to move in three dimensions ...
Two sets of physicists, one group based at Harvard and the other at the University of Maryland, have reported the discovery of time crystals, a state of matter whose existence seems to trash the notion of cause-and-effect. The Harvard group describes time crystals this way: They are substanc...
Discrete logarithms are the foundation of elliptic curve cryptosystems (ECC). In 1996, Lov Grover published “A fast quantum mechanical algorithm for database search” [2]. His algorithm inverts one-way functions in time. It applies to symmetric ciphers and cryptographic hashes. Whenever quantum ...