Charge qubit dynamics in a double quantum dot coupled to phonons

Wu, Zhuo-Jie; Zhu, Ka-Di; Yuan, Xiao-Zhong; Jiang, Yi-Wen; Zheng, Hang

doi:10.1103/physrevb.71.205323

Cited by 51 publications

(64 citation statements)

References 32 publications

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“…Neglecting the higher order tunneling between leads and the dots, the effective Hamiltonian in the manipulation process reads [11,14] …”

Section: Modelsmentioning

confidence: 99%

“…As in Refs. [11,12] in this paper we set the sound velocity in the GaAs crystal s ≈ 5 × 10 3 m/s. With the parameters of GaAs in Ref.…”

Section: Modelsmentioning

confidence: 99%

“…Thus, Thorwart et al conclude that the piezoelectric coupling phonon decoherence is a subordinate mechanism in decoherence of the DQD charge qubit. Recently, Wu et al [11] gave the spectral density functions of PCPB as well as DCPB. Then how about the DCPB to the decoherence of the DQD charge qubit?…”

Section: Introductionmentioning

confidence: 99%

“…The method is expected to become increasingly unreliable at DQD with larger interdot tunneling amplitudes. Wu et al [11] investigated the decoherence in terms of a perturbation treatment based on a unitary transformation. The Born-Markov approximation has not been used in the method but it neglects some terms of the effective Hamiltonian with high excited states.…”

Section: Introductionmentioning

confidence: 99%

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Non-Markovian dynamics and phonon decoherence of a double quantum dot charge qubit

Liang

2005

Phys. Rev. B

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In this paper we investigate decoherence times of a double quantum dot (DQD) charge qubit due to it coupling with acoustic phonon baths. We individually consider the acoustic piezoelectric as well as deformation coupling phonon baths in the qubit environment. The decoherence times are calculated with two kinds of methods. One of them is based on the qusiadiabatic propagator path integral (QUAPI) and the other is based on Bloch equations, and two kinds of results are compared. It is shown that the theoretical decoherence times of the DQD charge qubit are shorter than the experimental reported results. It implies that the phonon couplings to the qubit play a subordinate role, resulting in the decoherence of the qubit.

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“…Neglecting the higher order tunneling between leads and the dots, the effective Hamiltonian in the manipulation process reads [11,14] …”

Section: Modelsmentioning

confidence: 99%

“…As in Refs. [11,12] in this paper we set the sound velocity in the GaAs crystal s ≈ 5 × 10 3 m/s. With the parameters of GaAs in Ref.…”

Section: Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Non-Markovian dynamics and phonon decoherence of a double quantum dot charge qubit

Liang

2005

Phys. Rev. B

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“…Other theoretical works 13,14,15,16,17 already describe the electron-phonon interaction for a single charge qubit in a GaAs/AlGaAs heterostructure. Moreover, also electronic Nyquist noise in the gate voltages affects the qubit system 18 .…”

Section: Introductionmentioning

confidence: 99%

Intrinsic phonon decoherence and quantum gates in coupled lateral quantum-dot charge qubits

et al. 2005

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Recent experiments by Hayashi et al. [Phys. Rev. Lett. 91, 226804 (2003)] demonstrate coherent oscillations of a charge quantum bit (qubit) in laterally defined quantum dots. We study the intrinsic electron-phonon decoherence and gate performance for the next step: a system of two coupled charge qubits. The effective decoherence model contains properties of local as well as collective decoherence. Decoherence channels can be classified by their multipole moments, which leads to different lowenergy spectra. It is shown that due to the super-Ohmic spectrum, the gate quality is limited by the single-qubit Hadamard gates. It can be significantly improved, by using double-dots with weak tunnel coupling.

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Atom‐Mediated Phonon Blockade and Controlled‐Z Gate in Superconducting Circuit System

et al. 2021

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A scheme to generate phonon blockade in a superconducting Josephson junction circuit system is proposed, where the photon, phonon, and artificial two‐level atom are bound into a tripartite interaction. The phonon blockade in the proposal mediated by the two‐level atom differs from the phonon blockade resulting from the single phonon resonance and the destructive interference between different paths, which can be generated within a weak coupling region and a large range of cavity detuning, even with a large optical dissipation rate. In addition, under certain condition, the unconventional photon blockade can be achieved but the phonon blockade is still maintained. Based on the phonon blockade, it is shown that the controlled‐Z gate (CZ) can be implemented with the tripartite interaction.

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Charge qubit dynamics in a double quantum dot coupled to phonons

Cited by 51 publications

References 32 publications

Non-Markovian dynamics and phonon decoherence of a double quantum dot charge qubit

Non-Markovian dynamics and phonon decoherence of a double quantum dot charge qubit

Intrinsic phonon decoherence and quantum gates in coupled lateral quantum-dot charge qubits

Atom‐Mediated Phonon Blockade and Controlled‐Z Gate in Superconducting Circuit System

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