Theoretical Study of Interaction between Photons and Single Spins

L. Lanco

Gabriel González, Michael Niklaus Leuenberger, Hubert Pascal Seigneur +1 more

We review our theoretical proposal on producing a scalable quantum network inside a photonic crystal. The qubits are represented by electron spins in quantum dots, each embedded inside a nanocavity that is produced by a defect in the photonic crystal. The coupling between the qubits is governed by single photons that are guided through waveguides in the photonic crystal, thereby interacting with the quantum dots by means of the conditional single-photon Faraday rotation, which provides the basic method to entangle single spins with single photons. Unlike other schemes using virtual photons, our scheme makes use of real single photons that produce the spin entanglement. Therefore all the spin-photon interactions can be performed locally at each site of a quantum dot, which is a key ingredient for making our quantum network scalable. Copyright © 2010 American Scientific Publishers All rights reserved.

Alex Hayat, Amir Feizpour, Aephraim M. Steinberg

We propose a scheme for weak-value amplification of probing a single-fermion interaction, and demonstrate it theoretically on quantum dot electron spins by mapping the state including energy and spin into a photon.

Bo Jing

L. Lanco

Yun‐Feng Xiao, Xu‐Bo Zou, Qihuang Gong +2 more

In this Chapter, with the nanocavities in photonic crystal, we theoretically introduce, derive, and demonstrate the robust implementation of a single spin-photon phase gate in a cavitydipole-cavity system. The conditions of accidental degeneracy are examined to enforce complete transfer, either in the forward transmission or in reflection, of the qubit. In addition, we observe that a photon pulse is strikingly reflected by a cavity interacting with a single spin, even under the bad-cavity limit. This combined nanocrystal-cavity system,