Cavity-assisted emission of polarization-entangled photons from biexcitons in quantum dots with fine-structure splitting

Schumacher, Stefan; Förstner, Jens; Zrenner, A.; Florian, Matthias; Gies, Christopher; Gärtner, P.; Jahnke, F.

doi:10.1364/oe.20.005335

Cited by 59 publications

(81 citation statements)

References 27 publications

(44 reference statements)

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“…We also mention the difference between our method and the previously-reported method for polarizationentangled two-photon N 00N state 36,37 . As discussed above, key of our method is to prepare N 00N -GES as an energy eigenstate, while the previous method relies on the spontaneous emission of the prepared biexciton state into degenerate two polarization modes.…”

Section: Discussionmentioning

confidence: 90%

“…8. Of course, this test (step 2) is cleared in the above-discussed 2002-state generator, and also in polarization-entangled 2002-state emitter 36 .…”

Section: Significance Of Stepmentioning

confidence: 99%

“…This paper is summarized and conclusion is made in Sec. IV, where we also mention the comparison with existing method on 2002-state generator 36,37 and future issue.…”

Section: Introductionmentioning

confidence: 98%

“…Quantum dots (QDs) are ideal solid-state quantum emitters 30 , whose emission rate can be increased further by embedding them inside photonic nanocavities [31][32][33][34][35] . Efficient generation method of polarization entangled two-photon N 00N state (N = 2) was proposed theoretically by using two polarization modes of nanocavity 36,37 . On the other hand, method using QDnanocavity systems for higher N 00N states with N > 2 has not been reported.…”

Section: Introductionmentioning

confidence: 99%

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Method for generating a photonic NOON state with quantum dots in coupled nanocavities

et al. 2017

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We propose a method to generate path-entangled N 00N -state photons from quantum dots (QDs) and coupled nanocavities. In the systems we considered, cavity mode frequencies are tuned close to the biexciton two-photon resonance. Under appropriate conditions, the system can have the target N 00N state in the energy eigenstate, as a consequence of destructive quantum interference. The N 00N state can be generated by the resonant laser excitation. This method, first introduced for two-photon N 00N state (N = 2), can be extended toward higher N 00N state (N > 2) based on our recipe, which is applied to the case of N = 4 as an example.

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Section: Discussionmentioning

confidence: 90%

“…8. Of course, this test (step 2) is cleared in the above-discussed 2002-state generator, and also in polarization-entangled 2002-state emitter 36 .…”

Section: Significance Of Stepmentioning

confidence: 99%

“…This paper is summarized and conclusion is made in Sec. IV, where we also mention the comparison with existing method on 2002-state generator 36,37 and future issue.…”

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Method for generating a photonic NOON state with quantum dots in coupled nanocavities

et al. 2017

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“…Such a model has been successfully applied to describe the light-dressed states in many semiconductor systems, and can readily be adopted to describe the exciton-biexciton system [5,7,8,[31][32][33]. By virtue of the unique valley selection rules in this system, the originally 4×4 Hamiltonian matrix can be simplified into two decoupled 2×2 Hamiltonian matriceŝ…”

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confidence: 99%

Observation of Intervalley Biexcitonic Optical Stark Effect in Monolayer WS₂

et al. 2016

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Coherent optical dressing of quantum materials offers technological advantages to control their electronic properties, such as the electronic valley degree of freedom in monolayer transition metal dichalcogenides (TMDs). Here, we observe a new type of optical Stark effect in monolayer WS2, one that is mediated by intervalley biexcitons under the blue-detuned driving with circularly polarized light. We found that such helical optical driving not only induces an exciton energy downshift at the excitation valley, but also causes an anomalous energy upshift at the opposite valley, which is normally forbidden by the exciton selection rules but now made accessible through the intervalley biexcitons. These findings reveal the critical, but hitherto neglected, role of biexcitons to couple the two seemingly independent valleys, and to enhance the optical control in valleytronics.Keywords: WS2, valley, biexciton, blue detuned, optical Stark effect, ultrafast opticsMonolayer TMDs host tightly-bound excitons in two degenerate but inequivalent valleys (K and K ), which can be selectively photoexcited using left (σ − ) or right (σ + ) circularly polarized light (Fig 1a) [1-4]. The energy levels of these excitons can be tuned optically in a valley-selective manner by means of the optical Stark effect [5,6]. Prior research has demonstrated that monolayer TMDs driven by below-resonance (red-detuned) circularly polarized light can exhibit an upshifted exciton level, either at the K or K valleys depending on the helicity, while keeping the opposite valley unchanged. This valley-specific phenomenon arises from the exciton state repulsion by the photon-dressed state in the same valley, a mechanism consistent with other optical Stark effects in solids [7,8].Despite much recent progress, a complete understanding of the optical Stark effect in monolayer TMDs is still lacking. First, the anticipated complementary effect of using above-resonance (blue-detuned) light to downshift the exciton level has not been demonstrated. This is challenging because the blue-detuned light excites real exciton population, which can easily obscure the optical Stark effect. Secondly, when the detuning is sufficiently small and comparable to the biexciton binding energy, the effect may involve a coherent formation of the recently identified intervalley biexcitons [9,10]. These biexcitons are expected to have profound contributions to the optical Stark effect, as indicated by earlier studies in semiconductor quantum wells [11,12]. Elucidating these processes is therefore crucial to investigate the role of intervalley biexcitons in monolayer TMDs in order to obtain a thorough understanding of the coherent lightmatter interactions in this system.In this letter, we explore the optical Stark effect using blue-detuned optical driving in monolayer TMD WS 2 . * gedik@mit.edu We found that by driving the system using intense laser pulses with blue-detuned and left circular polarization, we can lower the exciton energy at the K valley. In addition, as the driving pho...

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Different Types of Photon Entanglement from a Constantly Driven Quantum Emitter Inside a Cavity

et al. 2020

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Bell states are the most prominent maximally entangled photon states. In a typical four‐level emitter, like a semiconductor quantum dot, the photon states exhibit only one type of Bell state entanglement. By adding an external driving to the emitter system, also other types of Bell state entanglement are reachable without changing the polarization basis. In this work, it is shown under which conditions the different types of entanglement occur and analytical equations are given to explain these findings. Furthermore, special points are identified, where the concurrence, being a measure for the degree of entanglement, drops to zero, while the coherences between the two‐photon states stay strong. Results of this work pave the way to achieve a controlled manipulation of the entanglement type in practical devices.

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Cavity-assisted emission of polarization-entangled photons from biexcitons in quantum dots with fine-structure splitting

Cited by 59 publications

References 27 publications

Method for generating a photonic NOON state with quantum dots in coupled nanocavities

Method for generating a photonic NOON state with quantum dots in coupled nanocavities

Observation of Intervalley Biexcitonic Optical Stark Effect in Monolayer WS₂

Different Types of Photon Entanglement from a Constantly Driven Quantum Emitter Inside a Cavity

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Cavity-assisted emission of polarization-entangled photons from biexcitons in quantum dots with fine-structure splitting

Cited by 59 publications

References 27 publications

Method for generating a photonic NOON state with quantum dots in coupled nanocavities

Method for generating a photonic NOON state with quantum dots in coupled nanocavities

Observation of Intervalley Biexcitonic Optical Stark Effect in Monolayer WS2

Different Types of Photon Entanglement from a Constantly Driven Quantum Emitter Inside a Cavity

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Observation of Intervalley Biexcitonic Optical Stark Effect in Monolayer WS₂