Entangled photon pairs from the optical decay of biexcitons

Savasta, Salvatore; Martino, G.; Girlanda, R.

doi:10.1016/s0038-1098(99)00233-1

Cited by 39 publications

(26 citation statements)

References 20 publications

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“…Hence the presence or absence of interference is a direct consequence of the complementarity principle enforced by the pair-correlation between signal and idler modes. A similar analysis on the more general many-polariton state given by expressions (2) and (3) leads to the same conclusions.…”

Section: Originalsupporting

confidence: 64%

“…Although spontaneous parametric processes involving polaritons in bulk semiconductors have been known for decades [1], the possibility of generating entangled photons by this process was theoretically pointed out only lately [2]. This result was based on a microscopic quantum theory of the nonlinear optical response of interacting electron systems relying on the dynamics controlled truncation scheme [3] extended to include light quantization [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Quantum optics with interacting polaritons

Savasta

Stefano

2006

Physica Status Solidi (b)

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PACS 42.50. Dv, 42.50.Nn, 71.35.Gg, 71.36.+c Recent theoretical and experimental investigations evidencing quantum optical effects in semiconductor microcavities are reported. In particular the results of an experiment that probes polariton quantum correlations by exploiting quantum complementarity are described. In this experiment, it has been shown that polaritons in two distinct idler modes interfere if and only if they share the same signal mode so that which-way information cannot be gathered, according to Bohr's quantum complementarity principle. The experimental results prove the existence of polariton pair correlations that store the which-way information. This interpretation is confirmed by a theoretical analysis of the measured interference visibility in terms of quantum Langevin equations. The devised experimental scheme employs two frequencydegenerate mutually-coherent pump modes. It is shown that this kind of two-pump parametric schemes can be exploited to realize a number of interesting tasks as the emission of polarization-entangled cavitypolariton states and the coherent control and trapping of parametric amplification in SMCs.

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Section: Originalsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Quantum optics with interacting polaritons

Savasta

Stefano

2006

Physica Status Solidi (b)

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“…2 Theory The entangled-photon generation by HPS was predicted by Savasta et al [4,5]. They calculated the scattering intensity and two-photon coincidence obtained from CuCl bulk film, and also showed their thickness dependence.…”

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confidence: 98%

“…Although the thickness dependence of S has already been calculated in Ref. [5], we must evaluate the S/N ratio to estimate the performance of the entangled-photon generation by HPS. When we write the incident power as I, S is proportional to I 2 , but N is to I 4 , because an uncorrelated pair is involved with two biexcitons, so the signal quality becomes worse with increasing I.…”

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confidence: 99%

Entangled‐photon generation via biexcitons in nano‐structures

Bamba

Ishihara

2006

Phys. Status Solidi (c)

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We have constructed quantum electrodynamics theory for excitons whose center-of-mass motion is confined in arbitrary-structured dielectrics with considering their nonlocal optical susceptibility. We systematically investigate entangled-photon generation via biexcitons in nano-to-macro scale materials by this theory. It is revealed that nano-structured materials provide scattering spectra explicitly reflecting quantum states of confined exciton-polaritons and are promising sources of entangled photons from the viewpoints of both efficiency and signal-to-noise ratio.1 Introduction Entangled-photon pairs, which play an important role in quantum information technology, are usually generated by parametric-down conversion (PDC). On the other hand, it is reported that hyper-parametric scattering (HPS) in CuCl also generates ultraviolet entangled photons [1]. In the HPS process, resonantly created biexcitons with no angular momentum collapse with the generation of polarization-correlated photon pairs conserving the angular momentum. This scheme shows much higher efficiency than the usual method by PDC because of the giant two-photon absorption in CuCl. Although the bulk crystal was used in Ref.[1], it is worth investigating the HPS process in nano-structures such as quantum dots [2,3], because manipulating the excitonic confinement has a potential to control characteristics of the entangled-photon generation. The purpose of our study is the investigation of HPS in nano-to-macro scale materials, where center-of-mass motions of excitons and biexcitons are confined.

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“…In 1996 the DCTS was extended in order to include in the description the quantization of the electromagnetic field [5]. This extension has been applied to the study of quantum optical phenomena in semiconductors as polariton entanglement [7]. Here we present an extension of the theory including the microscopic description of the exciton-phonon interaction.…”

mentioning

confidence: 99%

Influence of the phonon‐exciton interaction on exciton‐exciton quantum correlation in semiconductor microcavities

Portolan

Stefano

Savasta

et al. 2006

Phys. Status Solidi (c)

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We present an extension of the previous descriptions based on the Dynamics Controlled Truncation Scheme of light-matter interaction beyond mean-field, including the microscopic description of the exciton-photon interaction. This enables the microscopic analysis of the influence of decoherence and noise on the polariton quantum correlations originating from nonlinear optical processes. We expand the operators involved in the dynamics in terms of exact eigenstates of the electron system, the photon and phonon operators and treat phonon-assisted transitions within the Markov approximation. In particular, we present quantum Heisenberg-Langevin equations describing light-induced excitations in semiconductor systems interacting with the phonon bath. This theoretical framework is applied to study the influence of dephasing and noise due to photoluminescence on polariton quantum correlations generated by parametric emission in microcavities.Femtosecond spectroscopy in semiconductors and in semiconductor quantum structures, gives access to the physics of coherences, correlations and quantum kinetics involving charge, spin and lattice degrees of freedom. It has been greatly exploited because excitation with ultrashort optical pulses in general results in the creation of coherent superpositions and many-particle states. Thus it constitutes a very promising powerful tool for the study of correlation and an ideal arena for semiconductor cavity quantum electrodynamics (cavity QED) experiments as well as coherent control, manipulation, creation and measurement of non-classical states [1,2,3,4]. The analysis of non-classical correlations in semiconductors constitutes a challenging problem, where the physics of interacting electrons must be added to quantum optics and should include properly the effects of noise and dephasing induced by the electron-phonon interaction [6]. The mean-field (MF) is a cornerstone of the ultrafast dynamics at the semiconductor band-edge [1]. However, this level of the theory does not provide for a microscopic description of key effects in semiconductor quantum optics as Coulomb scattering and two-pair correlations. The Dynamics Controlled Truncation Scheme (DCTS) provides a (widely adopted) starting point for the microscopic theory of the light-matter interaction effects beyond mean-field [1] supplying a consistent and precise way to stop the infinite hierarchy of higher-order correlations which always appears in the microscopic approaches of manybody interacting systems. In 1996 the DCTS was extended in order to include in the description the quantization of the electromagnetic field [5]. This extension has been applied to the study of quantum optical phenomena in semiconductors as polariton entanglement [7]. Here we present an extension of the theory including the microscopic description of the exciton-phonon interaction. This enables the microscopic analysis of the influence of decoherence and noise on the polariton quantum correlations originating from nonlinear optical processes.

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Entangled photon pairs from the optical decay of biexcitons

Cited by 39 publications

References 20 publications

Quantum optics with interacting polaritons

Quantum optics with interacting polaritons

Entangled‐photon generation via biexcitons in nano‐structures

Influence of the phonon‐exciton interaction on exciton‐exciton quantum correlation in semiconductor microcavities

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