Creation of entangled states in coupled quantum dots via adiabatic rapid passage

Creatore, Celestino; Brierley, Richard; Phillips, R. T.; Littlewood, P. B.; Eastham, P. R.

doi:10.1103/physrevb.86.155442

Cited by 25 publications

(17 citation statements)

References 46 publications

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“…The robustness of quantum state inversion via ARP is due to the use of frequency-swept optical pulses, which result in a transfer of the system through an anticrossing for which the final state is uniquely identified with the exciton after the laser pulse is over [7][8][9][10][11][12]. Building upon demonstrations in atomic systems [7,8], ARP was recently achieved experimentally in single semiconductor quantum dots [13,14], paving the way for application to efficient single and entangled photon sources [15,16], quantum gates [11,[17][18][19][20], all-optical switches [9,12], and the realization of a Bose-Einstein condensate in a QD ensemble [21].…”

Section: Introductionmentioning

confidence: 99%

Subpicosecond adiabatic rapid passage on a single semiconductor quantum dot: Phonon-mediated dephasing in the strong-driving regime

et al. 2014

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We demonstrate adiabatic rapid passage on a subpicosecond time scale in a single semiconductor quantum dot, enabling the exploration of a regime of strong (and rapidly varying) Rabi energies for optical control of excitons. An observed dependence of the exciton inversion efficiency on the sign of the pulse chirp demonstrates the dominance of phonon-mediated dephasing, which is suppressed for positive chirp at low temperature. Our findings will support the realization of dynamical decoupling strategies and suggest that multiphonon emission and/or non-Markovian effects should be taken into account.

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Section: Introductionmentioning

confidence: 99%

Subpicosecond adiabatic rapid passage on a single semiconductor quantum dot: Phonon-mediated dephasing in the strong-driving regime

et al. 2014

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“…ARP can also be used to generate entanglement in double dot systems. 6 However, as QDs are embedded in a semiconductor crystal matrix, carrier-phonon interactions are usually found to considerably limit the fidelity of various optical control schemes. Phonon-induced decoherence processes are inevitable in such systems and lead to loss of information.…”

Section: Introductionmentioning

confidence: 99%

Dephasing in the adiabatic rapid passage in quantum dots: Role of phonon-assisted biexciton generation

et al. 2012

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We study the evolution of an exciton confined in a quantum dot adiabatically controlled by a frequency-swept (chirped) laser pulse in the presence of carrier-phonon coupling. We focus on the dynamics induced by a linearly polarized beam and analyze the decoherence due to phonon-assisted biexciton generation. We show that if the biexciton state is shifted down by a few meV, as is typically the case, then the resulting decoherence is strong even at low temperatures. As a result, efficient state preparation is restricted to a small parameter area corresponding to low temperatures, positive chirps, and moderate pulse areas.

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“…The generation and preservation of bipartite or multipartite quantum correlations have been widely studied both theoretically [7][8][9][10][11][12][13][14][15][16][17][18][19][20] and experimentally [21][22][23][24][25][26] in recent years. Usually, people use of methods to create entanglement either indirect coupled quantum systems or direct coupled quantum systems [27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Generation and protection of steady-state quantum correlations due to quantum channels with memory

Guo

Mao-Fa

Wang

et al. 2016

Quantum Inf Process

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We have proposed a scheme of the generation and preservation of two-qubit steady-state quantum correlations through quantum channels where successive uses of the channels are correlated. Different types of noisy channels with memory, such as amplitude damping, phase-damping, and depolarizing channels have been taken into account. Some analytical or numerical results are presented. The effect of channels with memory on dynamics of quantum correlations has been discussed in detail. The results show that, steady-state entanglement between two initial qubits without entanglement subject to amplitude damping channel with memory can be generated. The entanglement creation is related to the memory coefficient of channel µ. The stronger the memory coefficient of channel µ is, the more the entanglement creation is, and the earlier the separable state becomes the entangled state. The result also shows that there exists nonlocality in the absence of entanglement. Besides, we compare the dynamics of entanglement with that of quantum discord when a two-qubit system is initially prepared in an entangled state. We show that entanglement dynamics suddenly disappears, while quantum discord displays only in the asymptotic limit. Furthermore, two-qubit quantum correlations can be preserved at a long time in the limit of µ → 1.

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Creation of entangled states in coupled quantum dots via adiabatic rapid passage

Cited by 25 publications

References 46 publications

Subpicosecond adiabatic rapid passage on a single semiconductor quantum dot: Phonon-mediated dephasing in the strong-driving regime

Subpicosecond adiabatic rapid passage on a single semiconductor quantum dot: Phonon-mediated dephasing in the strong-driving regime

Dephasing in the adiabatic rapid passage in quantum dots: Role of phonon-assisted biexciton generation

Generation and protection of steady-state quantum correlations due to quantum channels with memory

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