We report on a microwave cavity experiment where exceptional points (EPs), which are square root singularities of the eigenvalues as function of a complex interaction parameter, are encircled in theâ€¦ (More)

A microwave experiment has been realized to measure the phase difference of the oscillating electric field at two points inside the cavity. The technique has been applied to a dissipative resonatorâ€¦ (More)

We demonstrate the presence of parity-time (PT) symmetry for the non-Hermitian two-state Hamiltonian of a dissipative microwave billiard in the vicinity of an exceptional point (EP). The shape of theâ€¦ (More)

Security policy is increasingly being used as a vehicle for specifying complex entity relationships. When used to define group security, policy must be extended to state the entirety of the securityâ€¦ (More)

Physical review. E, Statistical, nonlinear, andâ€¦

2004

We calculate analytically the geometric phases that the eigenvectors of a parametric dissipative two-state system described by a complex symmetric Hamiltonian pick up when an exceptional point (EP)â€¦ (More)

This document presents an ISAMKP Domain of Interpretation (DOI) for group key management to support secure group communications. The "GDOI" incorporates the definition of a Phase 1 SA of the Internetâ€¦ (More)

Physical review. E, Statistical, nonlinear, andâ€¦

2008

We measure the transmission and reflection amplitudes of microwaves in a resonator coupled to two antennas at room temperature in the regime of weakly overlapping resonances and in a frequency rangeâ€¦ (More)