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Chinese Physics Letters

N -Qubit W State of Spatially Separated Atoms via Fractional Adiabatic Passage

Anshou Zheng, Jibing Liu, Hongyun Chen

Published Aug 1, 2011• 7 citations
Publisher

Abstract

An alternative scheme is presented to realize an N-qubit W state with distant atoms trapped in spatially separated optical cavities coupled by optical fibers via a fractional adiabatic passage. The present scheme is tolerant to device parameter nonuniformity and does not need to accurately control the experimental time by employing the fractional stimulated Raman adiabatic passage. In addition, the excited states of atoms are adiabatically eliminated and no additional qubit is required. Cavity decay, fiber losses and atomic spontaneous emission can all be greatly suppressed in the present scheme.

DOI
10.1088/0256-307x/28/8/080303

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An alternative scheme is presented to realize an N-qubit W state with distant atoms trapped in spatially separated optical cavities coupled by optical fibers via a fractional adiabatic passage. The present scheme is tolerant to device parameter nonuniformity and does not need to accurately control the experimental time by employing the fractional stimulated Raman adiabatic passage. In addition, the excited states of atoms are adiabatically eliminated and no additional qubit is required. Cavity decay, fiber losses and atomic spontaneous emission can all be greatly suppressed in the present scheme.
We propose several robust schemes to prepare entangled states among spatially separated $\ensuremath{\Lambda}$-type atoms via stimulated Raman adiabatic passage and fractional stimulated Raman adiabatic passage techniques. The atomic spontaneous radiation, the cavity decay, and the fiber loss are efficiently suppressed by engineering adiabatic passage and controlling appropriately atom-field couplings. The schemes can be extended to generate the nnn-cavity mode WWW state.
We propose a scheme to deterministically generate Greenberger–Horne–Zeilinger states of N≥3 atoms trapped in spatially separated cavities connected by optical fibers. The scheme is based on the technique of fractional stimulated Raman adiabatic passage, which is a one-step technique in the sense that one needs only to wait for the desired entangled state to be generated in the stationary regime. The parametrized shapes of the Rabi frequencies of the classical fields that drive the two end atoms are chosen appropriately to realize the scheme. We also show numerically that the proposed scheme is insensitive to fluctuations of the pulses’ parameters and, at the same time, that it is robust against decoherence caused by the dissipation due to fiber decay. Moreover, a relatively high fidelity can be obtained even in the presence of cavity decay and atomic spontaneous emission.
A scheme is presented to realize transfer of a three-dimensional quantum state between two atoms trapped in distant cavities connected by an optical fiber, whose mode is resonant with the polarization cavity modes. Performing an adiabatic passage along dark states, the fiber mode remains in the vacuum state and the population of the cavities being excited can be negligible under certain conditions. In addition, atomic transitions in our scheme are largely detuned from cavity modes. As a consequence, the atomic spontaneous emission and the fiber decay can be effectively eliminated. Furthermore, we give some discussions about the fidelity of our scheme.
A scheme is proposed to generate W state of N atoms trapped in a cavity, based on adiabatic passage along dark state. Taking advantage of adiabatic passage, the atoms have no probability of being excited and thus the atomic spontaneous emission is suppressed. The scheme is simple. It does not need to adjust the interaction time accurately, and does not need to prepare the cavity field in one-photon state. Numerical simulation shows that the successful probability of the scheme increases with the increasing of the atom number.
An alternative voltage-controlled scheme is proposed for the generation of an N-qubit W state with distant self-assembled semiconductor quantum dot molecules (QDMs) via adiabatic-varying tunnel coupling. The N semiconductor QDMs are trapped in N spatially separated cavities coupled with N−1 fibers. The present scheme takes full advantage of adiabatic passage and the exceptional features of semiconductor QDMs. The decoherence caused by the excited state spontaneous emission and the fiber loss was efficiently suppressed. In addition, our calculations show that the present scheme is robust against the deviation of the parameters.
We propose two relatively robust schemes to effectively generate controllable N-partite W states in atom-cavity-laser systems. In these schemes, we consider a situation where a traveling atom initially in the ground state, interacts simultaneously with the cavity-mode and the laser fields through stimulated Raman adiabatic passage and pulse area techniques in optical cavities. Losses due to atomic spontaneous emission are efficiently suppressed by employing appropriately designed atom-field couplings and suitable pulse ordering.