Effect of Low-Frequency Noise on Adiabatic Passage in a Superconducting Nanocircuit

Cognata, A. La; Caldara, P.; Valenti, Davide; Spagnolo, Bernardo; D’Arrigo, A.; Paladino, E.; Falci, G.

doi:10.1142/s0219749911006880

Cited by 9 publications

(6 citation statements)

References 30 publications

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“…The above observation implies that for practical purposes efficiency can be discussed entirely in terms of the sensitivity to detunings 45 . Diagrams in the (δ, δ p ) plane (Fig.…”

Section: A Effects Of Low-frequency Noisementioning

confidence: 96%

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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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“…The above observation implies that for practical purposes efficiency can be discussed entirely in terms of the sensitivity to detunings 45 . Diagrams in the (δ, δ p ) plane (Fig.…”

Section: A Effects Of Low-frequency Noisementioning

confidence: 96%

“…Therefore, we could easily choose κ = ν s /ν p ≈ n 12 /n 02 ≫ 1. However, using larger values of ν s does not improve the transfer efficiency in CPB's 34,45 , therefore we will let κ = 1 hereafter.…”

Section: Effect Of Broadband Colored Noise On Stirap In a Charge-mentioning

confidence: 99%

Design of a Lambda system for population transfer in superconducting nanocircuits

et al. 2013

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“…As usual the master equation for the time evolution of the matrix elements of the density matrix can be written in the eigenbasis of the system Hamiltonian, (11) with relaxation and dephasing described by the tensor R nmn ′ m ′ . However, for the driven system considered here, the eigenbasis, i.e., the energies E m (t) and R nmn ′ m ′ (t) also depend on time.…”

Section: B Bloch-redfield Approachmentioning

confidence: 99%

“…STIRAP, therefore, has also been proposed for achieving single-qubit rotations in quantum information experiments 7 . Specific protocols were discussed for superconducting qubits, charge qubits 8 , phase qubits 9 and the quantronium 10,11 . Experiments on electromagnetically induced transparency and the formation of a dark state, both effects closely related to STIRAP, have also been performed [12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Influence of two-level fluctuators on adiabatic passage techniques

et al. 2012

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We study the process of Stimulated Raman Adiabatic Passage (STIRAP) under the influence of a non-trivial solid-state environment, particularly the effect of two-level fluctuators (TLFs) as they are frequently present in solid-state devices. When the amplitudes of the driving-pulses used in STIRAP are in resonance with the level spacing of the fluctuators the quality of the protocol, i.e., the transferred population decreases sharply. In general the effect can not be reduced by speeding up the STIRAP process. We also discuss the effect of a structured noise environment on the process of Coherent Tunneling by Adiabatic Passage (CTAP). The effect of a weakly structured environment or TLFs with short coherence times on STIRAP and CTAP can be described by the Bloch-Redfield theory. For a strongly structured environment a higher-dimensional approach must be used, where the TLFs are treated as part of the system.Comment: 8 pages, 8 figure

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“…In particular, the relaxation from a metastable state under the influence of a dissipative environment constitutes an interesting application of the theory of this class of open quantum systems [1][2][3] to devices for quantum computation such as SQUIDs, multilevels nanodevices and others [4][5][6][7][8][9][10][11][12]. We consider a periodically driven quantum system, characterized by a metastable state, in interaction with a thermal bath described by the Caldeira-Leggett model [13].…”

Section: Introductionmentioning

confidence: 99%

Transient Dynamics and Asymptotic Populations in a Driven Metastable Quantum System

Magazzù¹,

Valenti²,

Caldara

et al. 2013

Acta Phys. Pol. B

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The transient dynamics of a periodically driven metastable quantum system, interacting with a heat bath, is investigated. The time evolution of the populations, within the framework of the Feynman-Vernon influence functional and in the discrete variable representation, is analyzed by varying the parameters of the external driving. The results display strong non-monotonic behaviour of the populations with respect to the driving frequency.

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Effect of Low-Frequency Noise on Adiabatic Passage in a Superconducting Nanocircuit

Cited by 9 publications

References 30 publications

Design of a Lambda system for population transfer in superconducting nanocircuits

Design of a Lambda system for population transfer in superconducting nanocircuits

Influence of two-level fluctuators on adiabatic passage techniques

Transient Dynamics and Asymptotic Populations in a Driven Metastable Quantum System

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