Howard E. Brandt

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The quantum circuit and design are presented for an optimized entangling probe attacking the BB84 Protocol of quantum key distribution (QKD) and yielding maximum information to the probe. Probe photon polarization states become optimally entangled with the signal states on their way between the legitimate transmitter and receiver. Although standard(More)
In recent experiments at the Harry Diamond Laboratories and at the Naval Research Laboratory<sup>1</sup>, intense microwave emission has been observed during reflex triode operation. A fully relativistic, time-dependent one-dimensional simulation code, based on the technique formulated by Birdsall and Bridges<sup>2</sup>, was written to investigate the(More)
Didactic heuristic arguments, based on the quantum mechanics of the vacuum and the structure of spacetime, are reviewed concerning particle creation from the vacuum by an electric field, vacuum radiation in an accelerated frame, black-hole radiation, minimum mass black holes, spacetime breakdown, maximal proper acceleration, the spacetime tangent bundle,(More)
We report on the construction of polarization-entangled photon sources for quantum key distribution (QKD) testbed using nonlinear optical process of spontaneous parametric down-conversion (SPDC) pumped by a 266nm and 351-nm continuous wave (cw) and a 415-nm femtosecond-pulsed laser sources. The eÆcient coupling of down-converted photons at 702 nm and 830 nm(More)
Using the self-consistent Vlasov approach, we calculate the sensitivity of the growth rate and frequency of the transverse magnetic modes of a relativistic backward-wave oscillator to Budker's parameter. A closed algebraic dispersion relation is derived, representing the linear stability properties of the free-streaming modes of a relativistic, thin,(More)
The physics of the turbutron is reviewed. This newly proposed high-power millimeter-wave source consists of an intensely oscillating relativistic turbulent electron plasma created in and beyond the gap of a diode configuration. The diode consists of an explosive cathode emitter and an extended anode structure connected to the inner and outer conductors,(More)
We describe a free space quantum cryptography system which is designed to allow continuous unattended key exchanges for periods of several days, and over ranges of a few kilometres. The system uses a four-laser faint-pulse transmission system running at a pulse rate of 10MHz to generate the required four alternative polarization states. The receiver module(More)
Experiments studying the phenomenology of the reflex triode ion accelerator have led to a simple anode design that produces an intense (5 kA average current, 1.7 MeV beam energy, 25 ns current pulse) pulsed ion beam in which greater than 95% of the ions generated are extracted through the virtual cathode. Subsequent experiments have also shown that a simple(More)