Creating a Quantum Gate Through Strong Coupling of a Two-Level System in a Nanocavity
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Since the dawn of human observation, we have been studying the interaction between light and the rest of the universe. From the harnessing of fire to the use of telephones, humans have been finding new ways to use light to communicate with one another. Today, our communications have transitioned to a nanolevel, and great strides have been made in the recent past within quantum computing and quantum information systems. These quantum computers are analogous to modern computers in the fact that modern computers compute using bits and logic gates, but quantum computers will transfer information using quantum gates created by a coupled two-level system. Transitioning a two-level system between states can be done in many different ways. In the past, studies would often show that a molecule with two specified energy states can transition between them based on atomic beam pulses. A more effective approach would be to use a classical or semiclassical field to transition between states. We find that quantum gates can be created through a variety of variations of a two-level system. Whether through a quantum dot, a single molecule transitioning between the electronic and vibrational frequency modes, or two molecules coupled by the cavity mode, a quantum gate can be utilized in many different applications. We show that depending on how you set up the initial conditions you can achieve several different types of quantum gates depending on the desired results.
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Quantum Gate