Fast optically driven spin qubit gates in an InAs quantum dot

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 may be constructed using a combination of optical pulses and either spin precession or the optically generated geometric phases.

[1]  I. Chuang,et al.  Quantum Computation and Quantum Information: Bibliography , 2010 .

[2]  P. Petroff,et al.  Stark-shift modulation absorption spectroscopy of single quantum dots , 2003 .

[3]  D. D. Awschalom,et al.  Quantum information processing using quantum dot spins and cavity QED , 1999 .

[4]  D. DiVincenzo,et al.  The Physical Implementation of Quantum Computation , 2000, quant-ph/0002077.

[5]  Thaddeus D. Ladd,et al.  Complete quantum control of a single quantum dot spin using ultrafast optical pulses , 2008, Nature.

[6]  D. DiVincenzo,et al.  Quantum computation with quantum dots , 1997, cond-mat/9701055.

[7]  Duncan G. Steel,et al.  Optically controlled locking of the nuclear field via coherent dark-state spectroscopy , 2009, Nature.

[8]  L. A. Coldren,et al.  Picosecond Coherent Optical Manipulation of a Single Electron Spin in a Quantum Dot , 2008, Science.

[9]  Dieter Schuh,et al.  Optically programmable electron spin memory using semiconductor quantum dots , 2004, Nature.

[10]  Pierre M. Petroff,et al.  A Coherent Single-Hole Spin in a Semiconductor , 2009, Science.

[11]  Aharonov,et al.  Phase change during a cyclic quantum evolution. , 1987, Physical review letters.

[12]  Yanwen Wu,et al.  Fast spin state initialization in a singly charged InAs-GaAs quantum dot by optical cooling. , 2007, Physical review letters.

[13]  Holy,et al.  Self-organized growth of three- dimensional quantum-Dot crystals with fcc-like stacking and a tunable lattice constant , 1998, Science.

[14]  Khaled Karrai,et al.  Quantum-Dot Spin-State Preparation with Near-Unity Fidelity , 2006, Science.

[15]  L A Coldren,et al.  Nondestructive Optical Measurements of a Single Electron Spin in a Quantum Dot , 2006, Science.