Tuneable nonlinearity in atomic response to a bichromatic field

Vudayagiri, Ashok; Tewari, Surya P.

doi:10.1088/0953-4075/39/18/021

Cited by 5 publications

(5 citation statements)

References 22 publications

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“…When both the π and σ lasers are simultaneously present in Figure 1, the system goes into a unique eigenstate involving all three states, which is of interest to the rest of the communication (Vudayagiri and Tewari, 2006;Vudayagiri, 2011). This unique state is the dressed state of the six-state Hamiltonian,…”

Section: Case Iii: Both π and σ Combinedmentioning

confidence: 99%

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Robust atomic states for quantum information with continuous variables

Vudayagiri

Sankhari

2023

Front. Quantum Sci. Technol.

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Using a set of Zeeman sublevels of an alkali atom such as rubidium or sodium, we propose to construct a pair of coherentc population trap (CPT) states, which can be individually addressed and populated at will. The system can be arranged such that there exists a dressed state that is a linear combination of these two CPT states. We have earlier shown the capability of forming discrete quantum gates using this configuration [J.Phys. B, (2006), 39, 3919]. In the present communication, we will show how the same configuration can be used to prepare and operate continuously varying states. The state can be mapped to a 2D parametric space in such a way that any desired vector within it can be prepared, and a continuous, adiabatic evolution from one vector to another is also possible. A method to exploit a continuous interaction potential, which can be used in quantum computation, is also suggested. We discuss how a continuous variable quantum computation can be performed using such states.

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Section: Case Iii: Both π and σ Combinedmentioning

confidence: 99%

“…6 is a combination of two trap states |ψ 0 〉 and |ψ − 〉. This combined state is also a trap state and will not evolve further (Vudayagiri and Tewari, 2006). In the form given in Eq.…”

Section: Case Iii: Both π and σ Combinedmentioning

confidence: 99%

Robust atomic states for quantum information with continuous variables

Vudayagiri

Sankhari

2023

Front. Quantum Sci. Technol.

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Section: The Configurationmentioning

confidence: 99%

“…More interestingly, if both E p and E z beams are present together, the steady state solution then is not a statistical mixture of the two trap states |ψ 0 and |ψ − , but a three component CPT states [7]…”

Section: The Configurationmentioning

confidence: 99%

Quantum logic gates using coherent population trapping states

Vudayagiri

2011

Pramana - J Phys

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A scheme is proposed for achieving a controlled phase gate using interaction between atomic spin dipoles. Further, the spin states are prepared in coherent population trap states (CPTs), which are robust against perturbations, laser fluctuations etc. We show that one-qubit and two-qubit operations can easily be obtained in this scheme. The scheme is also robust against decoherences due to spontaneous emissions as the CPT states used are dressed states formed out of Zeeman sublevels of ground states of the bare atom. However, certain practical issues are of concern in actually obtaining the scheme, which are also discussed at the end of this paper.Conventional computers handle information in the form of bits -which take up values 0 or 1. Quantum computers on the other hand, use quantum bits (qubits), which can be prepared in states 0, 1 or any superposition of the two. Algorithms of quantum computation exploit this unique feature of quantum mechanical system to solve certain class of computational problems with lesser number of steps [1]. Hence there is a race to produce a reliable, robust and scalable quantum mechanical system which can be used as gates for quantum logic. There have been several attempts in the past to prepare such a system, using NMR of large molecules, quantum dot structures, ions in linear traps or neutral atoms in optical lattices [2,3], each system with its own benefits and drawbacks. One of the major requirement for designing a QC system is that they should be robust and reliable while interactions between any two of them should be on-demand. One such system is proposed here which involves neutral atoms prepared in coherent population trap (CPT) states. It is shown in this paper that such systems can be easily prepared and manipulated and it is possible to build onequbit and two-qubit gates using them. Since CPT states are 'dark states' of the atom-light interaction, the atoms prepared in such states will not interact with the light any more [4,5]. They will not evolve in time also, since they are already eigenstates of the full Hamiltonian that consist of atomic as well as interaction terms.

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“…It is important to note that the probe field is typically treated as a weak field and the control field as a strong field, such that perturbation theory can be employed to derive the linear effect of the atomic medium on the probe field propagation. There have been theoretical and experimental studies where the probe is not necessarily weak [26][27][28]. In this situation, the effect of the atomic coherence on the propagation dynamics of the control field need to be taken into account [29].…”

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confidence: 99%

Optical cloning of arbitrary images beyond the diffraction limits

et al. 2013

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Cloning of arbitrary images encoded onto the spatial profile of a laser beam onto that of a second beam is theoretically investigated. The two fields couple to an atomic lambda system in a coherent population trapping configuration. In particular, the case in which the probe and control fields are of comparable strength is considered. By considering more and more complex structures, we eventually find that our method is suitable to clone arbitrary images, which we demonstrated by a full numerical simulation of the propagation dynamics of both applied fields in the atomic medium, with the three letters "CPT" encoded on the initial control field profile. We find that the cloned structures have feature sizes reduced by about a factor of 2 compared to the initial images, consistent with a recent related experiment.Comment: 9 pages, 8 figure

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Tuneable nonlinearity in atomic response to a bichromatic field

Cited by 5 publications

References 22 publications

Robust atomic states for quantum information with continuous variables

Robust atomic states for quantum information with continuous variables

Quantum logic gates using coherent population trapping states

Optical cloning of arbitrary images beyond the diffraction limits

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