Abstract: A method of using a quantum random number generator, QRNG, for security applications, a system for security applications, and a user device for a system for security applications. The method comprises the steps of generating one or more quantum keys using the QRNG; storing, using a secure network, corresponding sets of the quantum keys in a server located at a controlled access location and in a quantum key token, QKT, for a user, respectively; and using the corresponding sets of quantum keys for secure transmission between the server and a user device comprising the QKT when outside the secure network or for access control to the controlled access location.

Abstract: A tennis practice apparatus (10) has a supporting surface net (12). The net (12) is divided into a lower portion (18) corresponding in height to a regulation tennis net and two court portions (20, 22) above the tennis net portion (18). Elastics (14) position the net (12) in a substantially vertical position. Target pockets (26, 28, 30, 34, 36, 38) are positioned in the court portions (20, 22) of the net (12). The target pockets (26, 28, 30, 34, 36, 38) each have an opening at the net (12). The target pockets (26, 28, 30, 34, 36, 38) are dimensioned and configured to receive a tennis ball directed at one of the openings.