Analysis of dephasing mechanisms in a standing-wave dipole trap

Kuhr, Stefan; Alt, Wolfgang; Schrader, D.; Dotsenko, Igor; Miroshnychenko, Yevhen; Rauschenbeutel, Arno; Meschede, Dieter

doi:10.1103/physreva.72.023406

Cited by 167 publications

(233 citation statements)

References 27 publications

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“…Taking into account that we are working with an ensemble of atoms which are thermally distributed in the dipole trap one can follow the calculations in [10] giving…”

Section: Dephasing and Coherencementioning

confidence: 99%

“…Long coherence times are therefore a crucial parameter for the applicability of a physical system for quantum information processing. We follow the previously discussed methods to study decoherence of quantum states of neutral atoms in optical dipole traps [8,9,10]. A theoretical description of these effects can be based on the Bloch equations [11]…”

Section: Dephasing and Coherencementioning

confidence: 99%

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Coherent manipulation of atomic qubits in optical micropotentials

et al. 2006

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We experimentally demonstrate the coherent manipulation of atomic states in far-detuned dipole traps and registers of dipole traps based on two-dimensional arrays of microlenses. By applying Rabi, Ramsey, and spin-echo techniques, we systematically investigate the dephasing mechanisms and determine the coherence time. Simultaneous Ramsey measurements in up to 16 dipole traps are performed and proves the scalability of our approach. This represents an important step in the application of scalable registers of atomic qubits for quantum information processing. In addition, this system can serve as the basis for novel atomic clocks making use of the parallel operation of a large number of individual clocks each remaining separately addressable.

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“…Taking into account that we are working with an ensemble of atoms which are thermally distributed in the dipole trap one can follow the calculations in [10] giving…”

Section: Dephasing and Coherencementioning

confidence: 99%

Section: Dephasing and Coherencementioning

confidence: 99%

Coherent manipulation of atomic qubits in optical micropotentials

et al. 2006

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“…where [18,26], is the dephasing rate in 1/ms due to atomic motion in the FORT, U 0 is the peak FORT potential, δ 0 /2π = (U 0 /k B ) × (1.5 kHz/mK), is the peak differential light shift of the FORT and T a is the atom temperature.…”

Section: Dephasing Errorsmentioning

confidence: 99%

Fidelity of a Rydberg-blockade quantum gate from simulated quantum process tomography

et al. 2012

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We present a detailed error analysis of a Rydberg blockade mediated controlled-NOT quantum gate between two neutral atoms as demonstrated recently in Phys. Rev. Lett. 104, 010503 (2010) and Phys. Rev. A 82, 030306 (2010). Numerical solutions of a master equation for the gate dynamics, including all known sources of technical error, are shown to be in good agreement with experiments. The primary sources of gate error are identified and suggestions given for future improvements. We also present numerical simulations of quantum process tomography to find the intrinsic fidelity, neglecting technical errors, of a Rydberg blockade controlled phase gate. The gate fidelity is characterized using trace overlap and trace distance measures. We show that the trace distance is linearly sensitive to errors arising from the finite Rydberg blockade shift and introduce a modified pulse sequence which corrects the linear errors. Our analysis shows that the intrinsic gate error extracted from simulated quantum process tomography can be under 0.002 for specific states of 87 Rb or Cs atoms. The relation between the process fidelity and the gate error probability used in calculations of fault tolerance thresholds is discussed.

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“…∆ T is the effective detuning of the trap laser from the D1 and D2 transitions in 133 Cs, given by [20,21,22] …”

Section: Rabi Oscillations Due To Raman Transitions In 133 Csmentioning

confidence: 99%

Comparison of Gaussian and super Gaussian laser beams for addressing atomic qubits

2016

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We study the fidelity of single qubit quantum gates performed with two-frequency laser fields that have a Gaussian or super Gaussian spatial mode. Numerical simulations are used to account for imperfections arising from atomic motion in an optical trap, spatially varying Stark shifts of the trapping and control beams, and transverse and axial misalignment of the control beams. Numerical results that account for the three dimensional distribution of control light show that a super Gaussian mode with intensity I ∼ e −2(r/w0) n provides reduced sensitivity to atomic motion and beam misalignment. Choosing a super Gaussian with n = 6 the decay time of finite temperature Rabi oscillations can be increased by a factor of 60 compared to an n = 2 Gaussian beam, while reducing crosstalk to neighboring qubit sites.

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Analysis of dephasing mechanisms in a standing-wave dipole trap

Cited by 167 publications

References 27 publications

Coherent manipulation of atomic qubits in optical micropotentials

Coherent manipulation of atomic qubits in optical micropotentials

Fidelity of a Rydberg-blockade quantum gate from simulated quantum process tomography

Comparison of Gaussian and super Gaussian laser beams for addressing atomic qubits

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