**An Exaltation of Qubits**

**Watercolour, crayon and Photoshop™**

**©2014 Charlene Brown**

**Exaltation is my favourite
collective noun. Though only properly used for larks, as far as I know, this
arrangement of quantum bits, or qubits, seemed to warrant it… BTW, the
arrangement, with X-axes converging dramatically, has nothing to do with how
quantum computing works – it just made a nice composition.**

**Quantum computing is immensely powerful,
or will be when someone gets some qubits to stand still long enough, because
qubits can store and process practically infinite amounts of information… A
classical bit can either be a 0 or a 1, a qubit is any possible combination or
superposition of ket 0 and ket 1, the bra-ket notation
used for describing quantum states, with complex numbers as coefficients of the
superposition. Thus, a qubit in a quantum computer is represented as any point
on the surface of a 3D sphere, the Bloch Sphere. Not only can each qubit be in
such a superposition state, but the system as a whole can be in a superposition
of every combination of different states of all the qubits. The number of
possible states that can be present in the superposition is huge – N qubits would
have 2**^{N} possible states. **The qubits in the picture are shown with a random
array of some of the simpler Bloch Sphere states, including ket 0 (top, left) and ket 1 (bottom left) and various points on the
X, Y or Z axes. **