Patent ID: 7236667

Claim:
A method for enhancing two-photon absorption in quantum logic operations wherein each qubit is represented by a superposition state of a single photon, comprising the steps of: directing at least two input qubits onto a device; and applying a quantum Zeno effect in the device by absorbing a pair of substantively coincident photons in one spatial mode through the device without absorbing a solo photon in the one spatial mode comprising the step of causing photons to impinge on an absorbing unit comprising at least one of an atom and a molecule and an ion having an excited state wherein the absorbing unit is placed in a nanocavity to enhance the absorption of the pair of substantively coincident photons under conditions in which one or more output photons that would otherwise be output by the device do not represent a result of a particular quantum logic operation that includes a square root of a SWAP operation on the at least two input qubits.