| Quantum Control of a Spin Qubit Coupled to a Photonic Crystal Cavity |
Dec 2012 |
26 pages |
| Authors:
Samuel G Carter; Timothy M Sweeney; Mijin Kim; Chul S Kim; Dmitry Solenov; Sophia E Economou; Thomas L Reinecke; Lily Yang; Allan S Bracker; Daniel Gammon; NAVAL RESEARCH LAB WASHINGTON DC
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 | A key ingredient for a quantum network is an interface between stationary quantum bits and photons, which act as flying qubits for interactions and communication. Photonic crystal architectures are promising platforms for enhancing the coupling of light to solid state qubits. Quantum dots can be integrated into a photonic crystal, with optical transitions coupling to photons and spin states forming a long-lived quantum memory. Many researchers have now succeeded in ... |
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| Optical Control of One and Two Hole Spins in Interacting Quantum Dots |
Nov 2011 |
8 pages |
| Authors:
Alex Greilich; Samuel G Carter; Danny Kim; Allan S Bracker; Daniel Gammon; NAVAL RESEARCH LAB WASHINGTON DC
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| A single hole spin in a semiconductor quantum dot has emerged as a quantum bit that is potentially superior to an electron spin. A key feature of holes is that they have a greatly reduced hyperfine interaction with nuclear spins, which is one of the biggest difficulties in working with an electron spin. It is now essential to show that holes are viable for quantum information processing by demonstrating fast ... |
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| Ultrafast Optical Control of Entanglement between Two Quantum-Dot Spins |
Mar 2011 |
8 pages |
| Authors:
Danny Kim; Samuel G Carter; Alex Greilich; Allan S Bracker; Daniel Gammon; NAVAL RESEARCH LAB WASHINGTON DC
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| The interaction between two quantum bits enables the creation of entanglement, the two-particle correlations that are at the heart of quantum information science. In semiconductor quantum dots, much work has focused on demonstrating control over single spin qubits using optical techniques. However, optical control of two spin qubits remains a major challenge for scaling to a fully fledged quantum-information platform. Here, we combine advances in vertically stacked quantum dots with ... |
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| Fast Optically Driven Spin Qubit Gates in an InAs Quantum Dot |
Jan 2010 |
11 pages |
| Authors:
Erik D Kim; Katherine Truex; Xiaodong Xu; Bo Sun; D G Steel; Allan S Bracker; Daniel Gammon; Lu Sham; MICHIGAN UNIV REGENTS ANN ARBOR DIV OF RESEARCH DEVELOPMENT AND ADMINISTRATION
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| The ability to manipulate the spin states of charges confined in quantum dots (QDs) is essential for the realization of a quantum computer based on such spins. Here, we present experimentally realized electron spin qubit gates in a single self-assembled InAs QD using a combination of picosecond optical pulses, spin precession about an external DC magnetic field and optically generated geometric phases. Arbitrary unitary operations on the electron spin qubit ... |
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| Optical Spin Initialization and Nondestructive Measurement in a Quantum Dot Molecule |
02 Dec 2008 |
5 pages |
| Authors:
Danny Kim; Sophia E Economou; Stefan C Badescu; Michael Scheibner; Allan S Bracker; Mark Bashkansky; Thomas L Reinecke; Daniel Gammon; NAVAL RESEARCH LAB WASHINGTON DC
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| The spin of an electron in a self-assembled InAs=GaAs quantum dot molecule is optically prepared and measured through the trion triplet states. A longitudinal magnetic field is used to tune two of the trion states into resonance, forming a superposition state through asymmetric spin exchange. As a result, spinflip Raman transitions can be used for optical spin initialization, while separate trion states enable cycling transitions for nondestructive measurement. With two-laser ... |
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| Optical Studies of Single Quantum Dots |
OCT 2002 |
14 pages |
| Authors:
Daniel Gammon; Duncan G. Steel; NAVAL RESEARCH LAB WASHINGTON DC
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| Atomic physics progressed rapidly at the beginning of the last century, thanks, in large part, to optical spectroscopy. Quantization and spin were discovered through optical studies, as were other fundamental atomic properties. With the advent of the laser, physicists learned how to manipulate atomic wavefunctions by applying coherent optical fields. More discoveries followed. Now, at the beginning of the new century, optical techniques are being used to explore a new ... |
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