Special Seminar

Semiconductor Qubits for Quantum Networks

Friday, 07 July 2017 12:00PM PDT
Special Seminar
Thaddeus Ladd
HRL Laboratories, LLC
Semiconductor Qubits for Quantum Networks
Jul 07, 2017 at 12PM


Semiconductor spin qubits in quantum dots have made substantial recent progress in coherent quantum control and memory.  This progress spans from the optically addressed self-assembled InGaAs/GaAs quantum dot system to the system of electrostatically gated dots in GaAs/AlGas or Si/SiGe.  Here I present the possibility of combining self-assembled dots with gated dots to enable an optically loaded quantum memory register, capable of interconverting photonic qubits to a multi-qubit memory and then providing high fidelity quantum logic on that memory.   Such a device would be critical to improve the relevant distance and speed of a quantum network.  I motivate this proposal with the results of several recent quantum control experiments in both self-assembled InGaAs/GaAs quantum dot molecules and in gated quantum dot molecules in isotopically enhanced Si/SiGe.  For more detail, see Phys. Rev. Applied 5, 024014 (2016).