Quantum information processing and cavity QED with quantum dots in photonic crystal nanocavities
Our aim is to combine the well-established capabilities of optically controlled InAs/GaAs quantum dot spins with an efficient solid-state light matter interface to develop a scalable architecture for quantum communication. Creation of such a spin qubit requires adding a single charge to a quantum dot in magnetic field, for access to a system with long-lived spin ground states as well as higher energy trion states that enable ultrafast optical access.
Fig. 1 Several different structures fabricated in GaAs with embedded InAs quantum dots
We have implemented a magnetospectroscopy setup capable of complete coherent control of the spin qubits and are currently investigating the suitability of several types of charged quantum dots (delta-doped and electrically controlled) for the implementation of efficient nodes.
Fig. 2 FIGURE CAPTION PLEASE - THANKS!
Integration of charging capability with photonic crystals, however, presents challenges because photonic crystals derive their confinement from reflections off dielectric interfaces, while charging typically requires metal contact. Thus, previous work has focused on P-I-N junctions embedded within the photonic crystal to achieve charging, but this geometry result in significant leakage current and thus ohmic heating, shifting the quantum dot energies. Furthermore, these devices result in band bending that decreases electron/hole wave function overlap. To this end, we have demonstrated a novel method for deterministic charging of InAs quantum dots embedded in photonic crystal nanoresonators using a unique vertical P-N-I-N junction within the photonic crystal membrane in order to eliminate leakage current and built-in field.
We also seek to better understand the effect of light-matter interfaces on the trion system. Our quantum dynamical simulations strongly suggest that photonic crystal cavities can significantly increase the initialization time of a quantum dot spin qubita while still allowing for spin manipulation operations to be performed. Here, the initialization time is one of the longer timescales in the system and thus significant benefit can be derived from its enhancement. Furthermore, such architectures have the capability to be integrated with other photonic crystal components in a scalable manner for an on-chip quantum network.
- Initialization of a Spin Qubit in a Site-Controlled Nanowire Quantum Dot via Optical Pumping, K. G. Lagoudakis, P. L. McMahon, K. A. Fischer, S. Puri, D. Dalacu, P. J. Poole, M. E. Reimer, V. Zwiller, Y. Yamamoto and J.Vučković (2014) (arXiv:1308.4463)
- Hole-Spin Pumping and Repumping in a p-type δ-doped InAs Quantum Dot, Konstantinos G. Lagoudakis, Kevin A. Fischer, Tomas Sarmiento, Kai Mueller and Jelena Vučković , Physical Review B 90, 121402(R) (2014).
- Deterministically Charged Quantum Dots in Photonic Crystal Nanoresonators for Efficient Spin-Photon Interfaces, Konstantinos G. Lagoudakis, Kevin Fischer, Tomas Sarmiento, Arka Majumdar, Armand Rundquist, Jesse Lu, Michal Bajcsy, and Jelena Vuckovic, New Journal of Physics 15, 113056 (2013) (arXiv:1308.4463)
- Proposed Coupling of an Electron Spin in a Semiconductor Quantum Dot to a Nanosize Optical Cavity, Arka Majumdar, Per Kaer, Michal Bajcsy, Erik D. Kim, Konstantinos G. Lagoudakis, Armand Rundquist, and Jelena Vuckovic, Phyisical Review Letters 111, 027402 (2013) (arXiv:1211.5571)
- Nonlinear Temporal Dynamics of Strongly Coupled Quantum Dot-Cavity System, Arka Majumdar, Dirk Englund, Michal Bajcsy, and Jelena Vuckovic, Physical Review A 85, 033802 (2012). (arXiv:1110.4538)
- Ultrafast Photon-Photon Interaction in a Strongly Coupled Quantum Dot-Cavity System, Dirk Englund✝, Arka Majumdar✝, Michal Bajcsy, Andrei Faraon, Pierre Petroff, and Jelena Vuckovic, Physical Review Letters 108, 093604 (2012). (arXiv:1107.2956)
- All Optical Switching With a Single Quantum Dot Strongly Coupled to a Photonic Crystal Cavity, Arka Majumdar, Michal Bajcsy, Dirk Englund, and Jelena Vuckovic, IEEE Journal of Selected Topics in Quantum Electronics Vol 18, pp. 1812-1817 (2012)
- Resonant excitation of a quantum dot strongly coupled to a photonic crystal nanocavity, Dirk Englund, Arka Majumdar, Andrei Faraon, Mitsuru Toishi, Nick Stoltz, Pierre Petroff, and Jelena
Vuckovic, Physical Review Letters , Vol 104, 073904 (2010)
- Off-resonant coupling between a single quantum dot and a nanobeam photonic crystal cavity, Armand Rundquist, Arka Majumdar, and Jelena Vuckovic, Applied Physics Letters 99, 251907 (2011). (arXiv:1110:0878)
- Phonon-mediated coupling between quantum dots through an off-resonant microcavity, Arka Majumdar, Michal Bajcsy, Armand Rundquist, Erik Kim, and Jelena Vuckovic, Physical Review B 85, 195301 (2012). (arXiv:1111.7097)
- Cavity Quantum Electrodynamics with a Single Quantum Dot Coupled to a Photonic Molecule, Arka Majumdar, Armand Rundquist, Michal Bajcsy, and Jelena Vuckovic, Physical Review B 86, 045315 (2012) (arXiv:1201.6244)
- Design and analysis of photonic crystal coupled cavity arrays for quantum simulation, Arka Majumdar, Armand Rundquist, Michal Bajcsy, Vaishno D. Dasika, Seth R. Bank, and Jelena Vuckovic, Physical Review B 86, 19 (2012) (arXiv:1209.3076)