Influence of two-level fluctuators on adiabatic passage techniques

Vogt, Nicolas; Cole, Jared H.; Marthaler, Michael; Schön, Gerd

doi:10.1103/physrevb.85.174515

Cited by 13 publications

(12 citation statements)

References 36 publications

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“…Moreover it has been pointed out that the presence of one or few more strongly coupled fluctuators may deteriorate the efficiency of ideal STIRAP 55 and it would be interesting to extend the investigation to the LZ scenario. Finally circuit-QED 23 based architectures are natural candidates for the implementation of STIRAP with quantum fields, the physics related to BBCN 56 must be studied in this broader scenario.…”

Section: Discussionmentioning

confidence: 99%

Design of a Lambda system for population transfer in superconducting nanocircuits

et al. 2013

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The implementation of a Lambda scheme in superconducting artificial atoms could allow detection of stimulated Raman adiabatic passage (STIRAP) and other quantum manipulations in the microwave regime. However symmetries which on one hand protect the system against decoherence, yield selection rules which may cancel coupling to the pump external drive. The tradeoff between efficient coupling and decoherence due to broad-band colored Noise (BBCN), which is often the main source of decoherence is addressed, in the class of nanodevices based on the Cooper pair box (CPB) design. We study transfer efficiency by STIRAP, showing that substantial efficiency is achieved for off-symmetric bias only in the charge-phase regime. We find a number of results uniquely due to non-Markovianity of BBCN, namely: (a) the efficiency for STIRAP depends essentially on noise channels in the trapped subspace; (b) low-frequency fluctuations can be analyzed and represented as fictitious correlated fluctuations of the detunings of the external drives; (c) a simple figure of merit for design and operating prescriptions allowing the observation of STIRAP is proposed. The emerging physical picture also applies to other classes of coherent nanodevices subject to BBCN.

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Section: Discussionmentioning

confidence: 99%

Design of a Lambda system for population transfer in superconducting nanocircuits

et al. 2013

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“…Among the other recent papers that have discussed the detrimental effect of stochastic processes on STIRAP we note Refs. [62][63][64][65][66][67][68][69][70][71][72][73].…”

Section: Fluctuationsmentioning

confidence: 99%

Detrimental consequences of small rapid laser fluctuations on stimulated Raman adiabatic passage

Yatsenko

Shore²,

Бергманн³

2014

Phys. Rev. A

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We discuss the detrimental effect of small rapid random fluctuations of laser-field amplitude and phase upon the efficiency of stimulated Raman adiabatic passage (STIRAP). Such fluctuations typically accompany the laser stabilization procedures that produce nearly monochromatic light on top of a much broader bandwidth Lorentz-profile pedestal which may carry only a few percent or less of the total power. As we will show, their effects differ qualitatively from the fluctuations that have hitherto been considered (for example, phase diffusion). We present analytic expressions for the population transfer efficiency of STIRAP when limited by stochastic fluctuations of this type. These expressions show, in contrast to situations discussed in the past in which population transfer improves with increasing peak Rabi frequencies, that for the weak broadband noise that accompanies a strong narrow-spectral component, there is an optimum value for the peak Rabi frequency and that the effect of fluctuations, although small, cannot be entirely eliminated in practice. The mission of the current work is to point out that, under the given circumstances, efforts in experiments trying to overcome the detrimental consequences of fluctuations by increasing the intensity, which is the intuitively proper approach, will not be successful.

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“…In this section we present the approach we use to solve the quantum master equation in Born-Markov approximation. By using the explicit time dependence of the system operators J ν (t) in the interaction picture we evaluate the time integrals including the correlation functions of the master equation [25,26] S αα ′ νν ′ (±τ ) ≡…”

Section: Acknowledgmentsmentioning

confidence: 99%

Magnetic adatoms as memory bits: A quantum master equation analysis

et al. 2015

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Due to underlying symmetries the ground states of magnetic adatoms may be highly stable, which opens perspectives for application as single-atom memory. A specific example is a single holmium atom (with $J=8$) on a platinum (111) surface for which exceptionally long lifetimes were observed in recent scanning tunneling microscopy studies. For control and read-out the atom must be coupled to electronic contacts. Hence the spin dynamics of the system is governed by a quantum master equation. Our analysis shows that in general it cannot be reduced to a classical master equation in the basis of the unperturbed crystal-field Hamiltonian. Rather, depending on parameters and control fields, "environment induced superselection" principles choose the appropriate set of basis states, which in turn determines the specific relaxation channels and lifetimes. Our simulations suggest that in ideal situations the lifetimes should be even longer than observed in the experiment. We, therefore, investigate the influence of various perturbations. We also study the initialization process of the state of the Ho atom by applied voltage pulses and conclude that fast, high fidelity preparation, on a $100\,\text{ns}$ timescale, should be possible.Comment: 14 pages, 11 figure

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Influence of two-level fluctuators on adiabatic passage techniques

Cited by 13 publications

References 36 publications

Design of a Lambda system for population transfer in superconducting nanocircuits

Design of a Lambda system for population transfer in superconducting nanocircuits

Detrimental consequences of small rapid laser fluctuations on stimulated Raman adiabatic passage

Magnetic adatoms as memory bits: A quantum master equation analysis

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