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Download PDF by Berardo Ruggiero, Per Delsing, Carmine Granata, Yuri A.: Quantum Computing in Solid State Systems

By Berardo Ruggiero, Per Delsing, Carmine Granata, Yuri A. Pashkin, P. Silvestrini

ISBN-10: 0387263322

ISBN-13: 9780387263328

Quantum Computation in reliable kingdom platforms discusses experimental implementation of quantum computing for info processing units; particularly observations of quantum habit in numerous reliable nation structures are provided. The complementary theoretical contributions supply versions of minimizing decoherence within the diverse structures.

Most contemporary theoretical and experimental effects on macroscopic quantum coherence of mesoscopic structures, in addition to the belief of solid-state qubits and quantum gates are mentioned. specific awareness is given to coherence results in Josephson units. different strong country systems---including quantum dots, optical, ion, and spin devices---are additionally discussed.

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5(a), the pulse-induced current under the application of the pulse sequence shown in Fig. 3(a) is plotted as a function of E J 1 . 3, this pulse sequence should produce the state α|01 > +β|10 >, which gives the output current of I1 ∝ |β|2 and I2 ∝ |α|2 = 1 − |β|2 . The anti-correlation between the two output currents observed in Fig. 5(a) is consistent with this expectation. 5 pA mainly due to the imperfection of both the input preparation and the gate operation. 5 pA. We cannot yet clearly explain this, but probably this is due to the extra pulse-induced current channel (different from the JQP process), whose amplitude depends on the Josephson energy.

Comparable discrimination power using DC switching has only been achieved in these devices at T ≤ 60 mK. As the temperature is increased, the switching probability curves broaden due to increased thermal fluctuations and the discriminating power decreases: at T = 480 mK, d = 49%. 17 After the initial ramp (40 ns) and settling period (20 ns), the reflected signal phase was extracted every 20 ns for a duration of 1 μs. By repeating this measurement, switching probability histograms were generated which was analyzed as P01 (t) = 1 − exp(− 01 · t).

Assuming that the noise is Gaussian we find the power spectrum density of fluctuations of the variable (δ e )2 (see, for example, Ref. [18]), S 2 (ω) = 2 +∞ −∞ dω S (ω )S (ω − ω). 24) 3. 25) ϕ = S X (0)/h¯ 2 . 26) where k = M/(L L T )1/2 is the dimensionless coupling coefficient. To evaluate Q ϕ for typical parameters of the qubit (leading for the operation points A, B and C to the value ( /E J0 )3 ∼ 10) let us assume that the quality factor of the tank circuit is Q ∼ 300 while the product k 2 Qβ L ∼ 10 which ensures sufficient resolution in determining the resonance frequencies ω0,1 .

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Quantum Computing in Solid State Systems by Berardo Ruggiero, Per Delsing, Carmine Granata, Yuri A. Pashkin, P. Silvestrini


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