Abstract
Quantum systems are usually very fragile and external fields will break the quantum coherence for information storing. Here we study the properties of coherence time (CT) of a quantum rod (QR) qubit by the Pekar type variational (PTV) method. Our numerical results show that the CT will increase with increasing QR’s transverse and longitudinal effective confinement lengths (TLECLs), whereas it is a decreasing function of the ellipsoidal aspect ratio (EAR) and polaron radius (PR). Consequently, we can improve the CT by (i) increasing the TLECLs; (ii) decreasing the EAR and PR.
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Imamoglu, A., Awschalom, D.D., Burkard, G., DiVincenzo, D.P., Loss, D., Sherwin, M., Small, A.: Quantum information processing using quantum dot spins and cavity qed. Phys. Rev. Lett. 83, 4204–4207 (1999)
Troiani, F., Hohenester, U., Molinari, E.: Exploiting exciton-exciton interactions in semiconductor quantum dots for quantum-information processing. Phys. Rev. B 62, R2263–R2266 (2000)
Reina, J.H., Quiroga, L., Johnson, N.F.: Quantum entanglement and information processing via excitons in optically driven quantum dots. Phys. Rev. A 62, 012305 (2000)
Krenner, H.J., Stufler, S., Sabathil, M., Clark, E.C., Ester, P., Bichler, M., Abstreiter, G., Finley, J.J., Zrenner, A.: Recent advances in exciton-based quantum information processing in quantum dot nanostructures. New. J. Phys. 7, 184 (2005)
Konstantatos, G., Huang, C.J., Levina, L., Lu, Z.H., Sargent, E.H.: Efficient infrared electroluminescent devices using solution-processed colloidal quantum dots. Adv. Funct. Mater. 15, 1865–1869 (2005)
Persano, A., Leo, G., Manna, L., Cola, A.: Charge carrier transport in thin films of colloidal cdse quantum rods. J. Appl. Phys. 104, 074306–6 (2008)
Htoon, H., Hollingsworth, J.A., Dickerson, R., Klimov, V.I.: Effect of zero- to one-dimensional transformation on multiparticle auger recombination in semiconductor quantum rods. Phys. Rev. Lett. 91, 227401–4 (2003)
Li, S.S., Xia, J.B., Liu, J.L., Yang, F.H., Niu, Z.C., Feng, S.L., Zheng, H.Z.: Inas/gaas single-electron quantum dot qubit. J. Appl. Phys. 90, 6151–6155 (2001)
Engel, H.A., Recher, P., Loss, D.: Electron spins in quantum dots for spintronics and quantum computation. Solid State Commun. 119, 229–236 (2001)
Kielpinski, D., Monroe, C., Wineland, D.J.: Architecture for a large-scale ion-trap quantum computer. Nature 417, 709–711 (2002)
Xiang, S.-H., Song, K.-H.: Entanglement decoherence of two-particle entangled states in a noisy environment. Acta Phys. Sin. 55, 529–534 (2006)
Petta, J.R., Johnson, A.C., Taylor, J.M., Laird, E.A., Yacoby, A., Lukin, M.D., Marcus, C.M., Hanson, M.P., Gossard, A.C.: Coherent manipulation of coupled electron spins in semiconductor quantum dots. Science 309, 2180–2184 (2005)
Kaji, R., Ohno, S., Hozumi, T., Adachi, S.: Effects of valence band mixing on hole spin coherence via hole-nuclei hyperfine interaction in inalas quantum dots. J. Appl. Phys. 113, 203511–6 (2013)
Varwig, S., Rene, A., Greilich, A., Yakovlev, D.R., Reuter, D., Wieck, A.D., Bayer, M.: Temperature dependence of hole spin coherence in (in, ga) as quantum dots measured by mode-locking and echo techniques. Phys. Rev. B 87, 115307–6 (2013)
Caram, J.R., Zheng, H., Dahlberg, P.D., Rolczynski, B.S., Griffin, G.B., Fidler, A.F., Dolzhnikov, D.S., Talapin, D.V., Engel, G.S.: Persistent interexcitonic quantum coherence in cdse quantum dots. J. Phys. Chem. Lett. 5, 196–204 (2014)
Zhang, Z.B., Jin, Z.M., Ma, H., Xu, Y., Lin, X., Ma, G.H., Sun, X.L.: Room-temperature spin coherence in zinc blende cdse quantum dots studied by time-resolved faraday ellipticity. Physica. E 56, 85–89 (2014)
Trentler, T.J., Hickman, K.M., Goel, S.C., Viano, A.M., Gibbons, P.C., Buhro, W.E.: Solution-liquid-solid growth of crystalline III-V semiconductors: An analogy to vapor-liquid-solid growth. Science 270, 1791–1794 (1995)
Peng, X., Manna, L., Yang, W., Wickham, J., Scher, E., Kadavanich, A., Alivisatos, A.P.: Shape control of cdse nanocrystals. Nature 404, 59–61 (2000)
Kan, S., Mokari, T., Rothenberg, E., Banin, U.: Synthesis and size-dependent properties of zinc-blende semiconductor quantum rods. Nat. Mater. 2, 155–158 (2003)
Xiao, W., Xiao, J.L.: Transition frequency of strong-coupling magnetopolaron in quantum rods. J. Low Temp. Phys. 165, 78–88 (2011)
Xiao, W., Xiao, J.L.: Coulomb bound potential quantum rod qubit. Superlattices Microstruct. 52, 851–860 (2012)
Xiao, W., Xiao, J.L.: The effect of impurity on transition frequency of bound polaron in quantum rods. Pramana-J. Phys. 79, 1485–1493 (2012)
Li, X.-Z., Xia, J.-B.: Electronic structure and optical properties of quantum rods with wurtzite structure. Phys. Rev. B 66, 115316 (2002)
Pekar, S.I.: Local quantum states of electrons in an ideal ion crystal. Zhurnal Eksperimentalnoi I Teoreticheskoi Fiziki 16, 341–348 (1946)
Landau, L.D., Lifshitz, E.M.: Quantum Mechanics (Nonrelativistic Theory). London (1987)
Rigetti, C., Gambetta, J.M., Poletto, S., Plourde, B.L.T., Chow, J.M., Córcoles, A.D., Smolin, J.A., Merkel, S.T., Rozen, J.R., Keefe, G.A., Rothwell, M.B., Ketchen, M.B., Steffen, M.: Superconducting qubit in a waveguide cavity with a coherence time approaching 0.1 ms. Phys. Rev. B 86, 100506 (2012)
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This project was supported by the National Science Foundation of China under Grant No. 11464034.
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Cai, C., Zhao, C. & Xiao, J. The Coherence Time of Quantum Rod Qubit. Int J Theor Phys 54, 1269–1274 (2015). https://doi.org/10.1007/s10773-014-2324-1
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DOI: https://doi.org/10.1007/s10773-014-2324-1