Tasawar Abbas

Dynamical revivals in spatiotemporal evolution of driven one dimensional box

We study periodically driven one dimensional box in the presence of weak modulating force and provide analytical calculations for time of quantum revivals and explain via spatiotemporal behavior. Presently introduced analysis can be applied to calculate the time of revivals in the system subject to any periodically changing weak external driving force. Spatiotemporal behavior provides the modified numerical values of revival times which have good agreement with our analytical results. Moreover, spatiotemporal evolution shows absence of symmetry beyond a revival time, which contributes to change of slope in subsequent canals and ridges.

Biasing a coin after the toss: asymmetric delayed choice quantum eraser via Bragg regime cavity QED

Quantum eraser (QE), on the one hand, is treated as the most intriguing phenomenon that puts a conception of the time in classical and quantum physics in contrast whereas, on the other hand, the same phenomenon is considered fallacious and based on the wrong arguments. Here, we propose an asymmetric delayed choice QE based on a Mach?Zandher?Bragg (MZB) atom interferometer that marks the intriguing effects more explicitly through delayed choice, tunable manipulation of the de Broglie matter wave interference. We also plot distinguishability D and fringe visibility V as a function of the atom?field interaction time utilized for the delayed choice eraser to highlight the counter-intuitive nature of the phenomenon. The interferometric scheme is based on Bragg diffraction of neutral two-level atoms through cavity fields. It is shown that the proposal is deterministic in nature and can be demonstrated experimentally with overall good fidelity utilizing the available technical?resources.

State engineering and information distribution over quantum networks via distant manipulations based on quantized momenta of neutral atoms

We propose experimentally feasible schemes for deterministic state engineering of a superposition as well as a variety of entangled states e.g., Bell, GHZ, Cluster and graph states through exploration of the quantized momenta states of the neutral atoms via distant manipulations. Such decoherence-resistant, distantly contrived momenta states are realized using first order, off-resonant Bragg diffraction of the two-level atoms from quantized cavity fields. The state preparation procedure, along with quantized momenta Bragg interactions, also invokes usual resonant and dispersive atom-field interactions and culminates deterministically into the states having overall good fidelities.

Matter-wave teleportation via cavity-field trans-pads

We propose experimentally feasible schematics to teleport one of the major attributes of matter—i.e. atomic motion in the momentum space—with the assistance of Bragg regime atom-cavity field interactions. In this context, the procedure for teleportation of a superposition of the external momentum of a neutral atom along with its atomic momentum Bell state is described in detail. The protocol is then generalized to cover the teleportation of any high-dimensional entangled state. Such schematics based on a hybrid system—i.e. atoms and photons—may solve a long standing problem by efficiently closing both the detection as well as locality loopholes simultaneously for Bells inequality testing, an option not available with either photons or atoms alone.