Publications

Solid State Quantum Computation

Original Papers:

W. Witzel, X. Hu, and S. Das Sarma, Decoherence induced by anisotropic hyperfine interaction in Si spin qubits. Physical Review B 76, 035212 (2007). Available at cond-mat/0701341.

M. Friesen, A. Biswas, X. Hu, and D. Lidar, Efficient Multiqubit Entanglement Based on an Exchange-Coupled Spin Bus. Physical Review Letters 98, 230503 (2007). Available at cond-mat/0702228.

S. Savelev, A.L. Rakhmanov, X. Hu, A. Kasumov, and F. Nori, Quantum electromechanics: Quantum tunneling near resonance and qubits from buckling nanoscale bars. Physical Review B 75, 165417 (2007). Available at cond-mat/0601019.

G. Ramon and X. Hu, Dynamical nuclear spin polarization and the Zamboni effect in gated double quantum dots. Physical Review B 75, 161301 (Rapid Communications) (2007). Available at cond-mat/0610585.

J.Q. You, X. Hu, S. Ashhab, and F. Nori, Low-decoherence flux qubit. Physical Review B 75, 140515 (Rapid Communications) (2007). Available at cond-mat/0609225.

T. Tanamoto, Yu-xi Liu, S. Fujita, X. Hu, and F. Nori, Cluster states in charge qubits based on coupled quantum dots. Physical Review Letters 97, 230501 (2006). Available at cond-mat/0602613.

S. Savelev, X. Hu, and F. Nori, Analytical Solution of Electron Spin Decoherence through Hyperfine Interactions in a Quantum Dot. New Journal of Physics 8, 105 (2006). Available at cond-mat/0412521.

C. Deng and X. Hu, Analytical Solution of Electron Spin Decoherence through Hyperfine Interactions in a Quantum Dot. Physical Review B 73, 241303 (Rapid Communications) (2006). Available at cond-mat/0510379.

V.N. Stavrou and X. Hu, Electron relaxation in a double quantum dot through two-phonon processes. Physical Review B 73, 205313 (2006). Available at cond-mat/0508239.

X. Hu and S. Das Sarma, Charge fluctuation induced dephasing of exchange coupled spin qubits. Physical Review Letters 96, 100501 (2006). Available at cond-mat/0507725.

M.J. Calderon, B. Koiller, X. Hu, and S. Das Sarma, Quantum control of donor electrons at the Si-SiO$_2$ interface. Physical Review Letters 96, 096802 (2006). Available at cond-mat/0508647.

B. Koiller, X. Hu, and S. Das Sarma, Electric field driven donor-based charge qubits in semiconductors. Physical Review B 73, 045319 (2006). Available at cond-mat/0510520.

J.Q. You, X. Hu, and F. Nori, Correlation-induced suppression of decoherence in capacitively coupled Cooper-pair boxes. Physical Review B 72, 144529 (2005). Available at cond-mat/0407423.

C. Deng and X. Hu, Nuclear spin diffusion in semiconductor nanostructures: Effects of hyperfine interactions. Physical Review B 72, 165333 (2005). Available at cond-mat/0312208.

T. Tanamoto and X. Hu, Measurement of two-qubit states with quantum point contacts coupled by a quantum dot. Journal of Physics: Condensed Matter 17, 6895-6909 (2005). Available at cond-mat/0310293.

V.N. Stavrou and X. Hu, Charge decoherence in laterally coupled quantum dots due to electron-phonon interactions. Physical Review B 72, 075362 (2005). Available at cond-mat/0503481.

X. Hu, B. Koiller, and S. Das Sarma, Charge qubits in semiconductor quantum computer architectures: Tunnel coupling and decoherence. Physical Review B 71, 235332 (2005). Available at cond-mat/0412340.

L.F. Wei, X. Li, X. Hu, and F. Nori, Performing quantum algorithms in the presence of dynamical phases. Physical Review A 71, 022317 (2005). Available at cond-mat/0305039.

C. Deng and X. Hu, Selective Dynamical Nuclear Spin Polarization in Spin-Blocked Double Dot. Physical Review B 71, 033307 (2005). Available at cond-mat/0402428.

C. Deng and X. Hu, Decoherence of Nuclear Spin Quantum Memory in a Quantum Dot. IEEE Trans. Nanotech. 4, 35 (2005). Available at cond-mat/0406478.

B. Koiller, R.B. Capaz, X. Hu, and S. Das Sarma, Shallow donor wavefunctions and donor-pair exchange in silicon: Ab initio theory and floating-phase Heitler-London approach. Physical Review B 70, 115207 (2004). Available at cond-mat/0402266.

X. Hu and S. Das Sarma, Double quantum dot turnstile as an electron spin entangler. Physical Review B 69, 115312 (2004). Available at cond-mat/0307024.

T. Tanamoto and X. Hu, Time dependent description of measurement process of two charged qubits by single electron transistors (SET). Physical Review B 69, 115301 (2004). Available at cond-mat/0309648.

X. Hu and S. Das Sarma, Spin swap gate in the presence of qubit inhomogeneity in a double quantum dot. Physical Review A 68, 052310 (2003). Available at cond-mat/0301612.

B. Koiller, X. Hu, H.D. Drew, and S. Das Sarma, Theory of Micro-Raman Spectroscopy for Entangled Donor States in Silicon. Physical Review Letters 90, 067401 (2003). Available at cond-mat/0207455.

X. Hu and S. Das Sarma, Gate errors in solid state quantum computer architectures. Physical Review A 66, 012312 (2002). Available at cond-mat/0202152.

B. Koiller, X. Hu, and S. Das Sarma, Strain effects on silicon donor exchange: Quantum computer architecture considerations. Physical Review B 66, 115201 (2002). Available at cond-mat/0112078.

B. Koiller, X. Hu, and S. Das Sarma, Exchange in silicon based quantum computer architecture. Physical Review Letters 88, 027903 (2002). Available at cond-mat/0106259.

R. de Sousa, X. Hu, and S. Das Sarma, Effect of an inhomogeneous external magnetic field on a quantum dot quantum computer. Physical Review A 64, 042307 (2001). Available at cond-mat/0103410.

X. Hu and S. Das Sarma, Spin-based quantum computation in multielectron quantum dots. Physical Review A 64, 042312 (2001). Available at cond-mat/0101102.

X. Hu, R. de Sousa, and S. Das Sarma, Interplay between Zeeman Coupling and Swap Action in Spin-based Quantum Computer Models: Error Correction in Inhomogeneous Magnetic Fields, Physical Review Letters 86, 918 (2001). Available at cond-mat/0004459.

X. Hu and S. Das Sarma, Hilbert space structure of a solid state quantum computer: two-electron states of a double quantum dot artificial molecule, Physical Review A 61, 062301 (2000). Available at quant-ph/9911080.

Review Papers:

B. Koiller, X. Hu, R.B. Capaz, A.S. Martins, and S. Das Sarma, Silicon-based spin and charge quantum computation. Anais da Academia Brasileira de Ciencias (Annals of Brazilian Academy of Science) 77, 201 (2005). Invited review by Brazilian Academy of Sciences. Available at cond-mat/0505169.

S. Das Sarma, R. de Sousa, X. Hu, and B. Koiller, Spin quantum computation in silicon nanostructures. Solid State Communications 133, 737 (2005). Available at cond-mat/0411755.

B. Koiller and X. Hu, Nanofabrication aspects of silicon-based spin quantum gates. IEEE Trans. Nanotech. 4, 113 (2005).

X. Hu, Quantum Dot Quantum Computing. A review to appear in the Springer Lecture Series. Available at cond-mat/0411012.

X. Hu and S. Das Sarma, Generating and Detecting Entangled Electron States in Nanostructures. SPIE Proceedings 5472, 107 (2004).

X. Hu and S. Das Sarma, Overview of spin-based quantum dot quantum computation. Phys. Stat. Sol. (b) 238, 360-365 (2003). Available at cond-mat/0211358.

X. Hu and S. Das Sarma, Gate errors in solid state quantum computation. In Quantum Computing and Quantum Bits in Mesoscopic Systems, edited by A. Leggett, B. Ruggiero, and P. Silvestrini (Kluwer, New York, 2003). Available at cond-mat/0207457.

S. Das Sarma, J. Fabian, X. Hu, and I. Zutic, Spin Electronics and Spin Computation, Solid State Communications 119, 207 (2001). Avaliable at cond-mat/0105247.

X. Hu, R. de Sousa, and S. Das Sarma, Decoherence and dephasing in spin-based solid state quantum computers. A review on decoherence issues in the Proceedings of the 7th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology. An extended version is available at cond-mat/0108339.

X. Hu and S. Das Sarma, Theoretical issues in spin-based quantum dot quantum computation. In Experimental Implementation of Quantum Computation (IQC'01), ed. by R.G. Clark (Rinton, Princeton, 2001). Available at cond-mat/0102019.

S. Das Sarma, J. Fabian, X. Hu, and I. Zutic, Issues, Concepts, and Challenges in Spintronics, IEEE 58th DRC Device Research Conference Digest (Cat. No.00TH8526) p. xii+176, 95-8. Available at cond-mat/0006369.

S. Das Sarma, J. Fabian, X. Hu, and I. Zutic, Theoretical Perspectives on Spintronics and Spin-Polarized Transport, IEEE Transactions on Magnetics 36, 2821 (2000). Available at cond-mat/0002256.

S. Das Sarma, J. Fabian, X. Hu, and I. Zutic, Spintronics: electron spin coherence, entanglement, and transport, Superlattice Microst 27, 289-295 (2000). Available at cond-mat/9912040.