You’ve apparently heard about Schrödinger’s cat, which abundantly is trapped in a box with a apparatus that is activated if a radioactive atom decays, absolution radiation. The act of attractive in the box collapses the atom’s beachcomber function—the algebraic description of its accompaniment —from a “superposition” of states to a audible state, which either kills the cat or let’s it alive addition day.
But did you apperceive that if you blink into the cat box frequently—thousands of times a second—you can either adjournment the acute best or, conversely, advance it? The adjournment is accepted as the breakthrough Zeno aftereffect and the dispatch as the breakthrough anti-Zeno effect.
The breakthrough Zeno aftereffect was alleged by affinity with the arrow absurdity conceived by the Greek philosopher Zeno: At any accustomed burning of time, an arrow in flight is motionless; how again can it move? Similarly, if an atom could be consistently abstinent to see if it is still in its antecedent state, it would consistently be begin to be in that state.
Both the Zeno and an the anti-Zeno furnishings are absolute and appear to absolute atoms. But how does this work? How can altitude either adjournment or advance the adulteration of the radioactive atom? What is “measurement,” anyway?
The physicist’s acknowledgment is that in adjustment to access advice about a breakthrough system, the arrangement charge be acerb accompanying to the ambiance for a abrupt aeon of time. So the ambition of altitude is to access information, but the able coupling to the ambiance agency that the act of altitude additionally necessarily disturbs the breakthrough system.
But what if the arrangement was abashed but no advice was anesthetized to the alfresco world? What would appear then? Would the atom still display the Zeno and anti-Zeno effects?
Kater Murch’s accumulation at Washington University in St. Louis has been exploring these questions with an bogus atom alleged a qubit. To analysis the role of altitude in the Zeno effects, they devised a new blazon of altitude alternation that disturbs the atom but learns annihilation about its state, which they alarm a “quasimeasurement.”
They address in the June 14, 2017, affair of Physical Review Letters that quasimeasurements, like measurements, account Zeno effects. Potentially the new compassionate of the attributes of altitude in breakthrough mechanics could led to new means of authoritative breakthrough systems.
Explore further: Researchers anticipate breakthrough errors from occurring by continuously watching a breakthrough arrangement
More information: P.?M. Harrington et al. Breakthrough Zeno Furnishings from Altitude Controlled Qubit-Bath Interactions, Physical Review Letters (2017). DOI: 10.1103/PhysRevLett.118.240401
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