Computer Science and Electrical Engineering
Quantum Computing Seminar

Thermal Light N-qubit

Tao Peng (PhD Advisor: Yanhua Shih)
UMBC Physics Department

2:30-3:00 Tuesday, 22 October 2013, ITE 325b

This talk will discuss the equipment and optical elements that required for building the incoherent thermal source, the qubit, and the detection scheme of the intensity fluctuation-fluctuation correlation.

All optical XOR, CNOT gates with initial insight
for quantum computation using linear optics

Omar Shehab (PhD Advisor: Samuel Lomonaco)
UMBC CSEE Department

3:00-3:30 pm, Tuesday, 22 October 2013, ITE 325b

The design for an all-optical XOR gate is proposed. The basic idea is to split the input beams, and let them cancel or strengthen each other selectively, or flip the encoded information based on their polarization properties. The information is encoded in terms of polarization of the beam. Polarization of a light beam is well understood, hence, the design should be feasible to implement. The truth table of the optical circuit is worked out and compared with the expected truth table. Then it is demonstrated that the design complies with the linear behavior of the XOR function.

Next, based on a similar idea, the design of an all-optical CNOT gate is proposed. The truth table for the gate is verified. Then, it is discussed how this approach can be used for Linear Optics Quantum Computation (LOQC). It is shown that a Hadamard gate, a rotation gate, and a CNOT gate make up a universal set of quantum gates based on linear optics. This novel approach requires no additional power supply, extra input beam or ancilla photon to operate. It also does not require an expensive and complex single photon source and detector. Only narrowband laser sources are required to operate these gates.

Organizer: Prof. Samuel Lomonaco, Sorry, you need javascript to view this email address.