Towards Quantum Teleportation Between a Photonic Qubit and a Quantum Dot Spin State JIA

Submitted for the DAMOP15 Meeting of The American Physical Society Towards Quantum Teleportation Between a Photonic Qubit and a Quantum Dot Spin State JIA JUN WONG, JIAN YANG, PAUL KWIAT, Univ of Illinois Urbana — Quantum teleportation plays a vital role in quantum computation and communication, as it provides an interface between dissimilar qubits, allowing the possibility to exploit experimental advantages presented in different quantum systems. For example, a quantum dot spin qubit can be used for long storage time while a telecom wavelength photonic qubit can be used for robust information transfer between distant parties. Here we are developing a narrowband single-photon source with the aim of demonstrating quantum teleportation of a photonic state to a quantum dot spin state. To ensure high indistinguishability between the photon sources, cavity-enhanced spontaneous parametric down-conversion is used to generate narrowband photons of 200 MHz, matching the entangled spinphoton state emitted from the quantum dot. The source cavity mainly consists of three optical components in sequence, type-II nonlinear crystal (PPKTP), a KTP crystal for double-resonance tuning and a concave output coupler. By placing a polarizing beam splitter after the source, a single photon can be heralded at an expected rate of 13 kHz. To achieve high fidelity, an electro-optic modulator can be used to match the frequencies of the down-conversion and quantum dot photons. Jia Jun Wong Univ of Illinois Urbana Date submitted: 29 Jan 2015 Electronic form version 1.4