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Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !
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Superconducting quantum computing is a promising implementation of quantum information that involves nanofabricated superconducting electrodes coupled through Josephson junctions. As in a superconducting electrode, the phase and the charge are conjugate variables, there exists three families of superconducting qubits, depending if the charge, the phase or neither of the two are good quantum numbers. This refers respectively to charge qubits, flux qubits, and hybrid qubits.
Unlike other physical implementations of a qubit which involve truly two-level systems, such as nuclear spin and photon polarization, the integrated quantum circuit involved in a superconducting qubit is a many-level system, of which only the first two levels are used as the computational basis. A basic requirement for such an implementation is that the energy levels are not uniformly spaced, so that photons of a particular frequency which cause transition between the 0 and 1 levels do not cause transitions from the first level to the higher levels as well. For electronic signals to be carried from one part of the circuit to another without energy loss and hence decoherence, the system also needs to be non-dissipative, i.e., the metallic parts involved should have zero resistance. These circuits need to be operated at low temperatures so that firstly superconductivity is realized, and secondly thermal fluctuations do not cause transitions between energy levels.
The simplest non-dissipative quantum circuit consists simply of an inductor and capacitor , with the metallic wires connecting them being superconducting. Here the flux through the inductor and the charge in the capacitor are canonically conjugate variables which obey the commutation relation
The Hamiltonian associated with this system is
which gives rise to the energy levels
|This quantum mechanics-related article is a stub. You can help Wikipedia by expanding it.|