Ultracold atom waves may shed light on rogue ocean killers

By precisely controlling the quantum behavior of an ultracold atomic gas, physicists have created a model system for studying the wave phenomenon that may bring about rogue waves in Earth’s oceans.

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Using math to investigate possibility of time travel

After some serious number crunching, a researcher says that he has come up with a mathematical model for a viable time machine: a Traversable Acausal Retrograde Domain in Space-time (TARDIS). He describes it as a bubble of space-time geometry which carries its contents backward and forwards through space and time as it tours a large circular path. The bubble moves through space-time at speeds greater than the speed of light at times, allowing it to move backward in time.

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A Cosmic-Ray Hunter Takes to the Sky

Angela Olinto’s new balloon experiment takes her one step closer to the unknown source of the most energetic particles in the universe. …

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Solution: ‘Friday the 13th’

There’s more than one good way to bring order to our unruly, seemingly arbitrary calendar. …

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New theoretical approach to describing non-equilibrium phase transitions

Two physicists have offered a way to mathematically describe a particular physics phenomenon called a phase transition in a system out of equilibrium. Such phenomena are central in physics, and understanding how they occur has been a long-held and vexing goal; their behavior and related effects are key to unlocking possibilities for new electronics and other next-generation technologies.

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2-D materials can conduct electricity at almost the speed of light

New two-dimensional quantum materials have been created with breakthrough electrical and magnetic attributes that could make them building blocks of future quantum computers and other advanced electronics. The researchers explored the physics behind the 2-D states of novel materials and determined they could push computers to new heights of speed and power.

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New atomically layered, thin magnet discovered

An unexpected magnetic property in a 2-D material has been found by scientists. The new atomically thin, flat magnet could have major implications for a wide range of applications, such as nanoscale memory, spintronic devices, and magnetic sensors, they say.

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Lindbladian purification

In a recent work (Burgarth et al 2014, Nat. Commun . 5 5173), it was shown that a series of frequent measurements can project the dynamics of a quantum system onto a subspace in which the dynamics can be more complex. In this subspace, even full controllability can be achieved, although the controllability over the system before the projection is very poor since the control Hamiltonians commute with each other. We can also think of the opposite: any Hamiltonians of a quantum system, which are in general noncommutative with each other, can be made commutative by embedding them in an extended Hilbert space, thus the dynamics in the extended space becomes trivial and simple. This idea of making noncommutative Hamiltonians commutative is called ‘Hamiltonian purification.’ The original noncommutative Hamiltonians are recovered by projecting the system back onto the original Hilbert space through frequent measurements. Here, we generalise this idea to open-system dynamics… …

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