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Each qubit exists in a superposition of zero and one (i.e. has non-zero probabilities to be a zero or a one) until measured.
The information stored in a single qubit exists in a superposition of two quantum states which indicates an arbitrary linear combination of two orthonormal basis.
It can escape via a strange quantum tunneling, in which the particle exists in a "superposition" of states that puts it, in effect, both inside and outside the nucleus at once.
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But a quantum magnet can exist in a "superposition" of up and down states at the same time.
"According to quantum mechanics, a bottle of Coke should be able to exist in a superposition of two locations, both here and there," said Dr. Wojciech H. Zurek, a theorist at Los Alamos National Laboratories in New Mexico.
It was clear to many physicists that using "qubits"—which, unlike ordinary bits, can exist in a "superposition" of the values 0 and 1 simultaneously might yield an exponential improvement in computing power.
But while a single classical two-bit register can store these numbers only one at a time, a pair of qubits can also exist in a superposition of these four basis states, each of which with its own complex coefficient (whose mod square, being interpreted as a probability, is normalized).
Until either of the particles is observed, they exist in a superposition of two quantum states.
In contrast, a quantum bit (qubit) exists in a wavelike superposition of values from 0 to 1; thus, for example, a 4-qubit computer register can hold 16 different numbers simultaneously.
The record holders, a group in Innsbruck, use a device called an ion trap in which each qubit exists as a superposition of a rubidium atom at different energies.
To start with, the electron can be in a superposition of its two states.
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