Entanglement between a Quantum Dot Spin and a Photon

Schaibley, John; Burgers, A. P.; McCracken, Gregory A.; Duan, Luming; Berman, P. R.; Steel, Duncan G.; Bracker, Allan S.; Gammon, D.; Sham, L. J.

doi:10.1364/cleo_qels.2013.qm3c.4

Cited by 26 publications

(33 citation statements)

References 10 publications

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“…A key ingredient is the realization of entanglement between a QD-spin and a single photon. Several experiments have demonstrated this by utilizing spontaneous emission [5][6][7] , but these methods require postselection and are therefore not suitable for deterministic approaches. The need for postselection can be eliminated by using the spin-dependent reflection or transmission of a photon by a quantum dot in a cavity QED system.…”

Section: Introductionmentioning

confidence: 99%

Polarization degenerate solid-state cavity quantum electrodynamics

et al. 2015

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A polarization degenerate microcavity containing charge-controlled quantum dots (QDs) enables equal coupling of all polarization degrees of freedom of light to the cavity QED system, which we explore through resonant laser spectroscopy. We first measure interference of the two fine-split neutral QD transitions and find very good agreement of this V-type three-level system with a coherent polarization dependent cavity QED model. We also study a charged QD that suffers from decoherence, and find also in this case that availability of the full polarization degrees of freedom is crucial to reveal the dynamics of the QD transitions. Our results pave the way for postselection-free quantum devices based on electron spin-photon polarization entanglement.

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Section: Introductionmentioning

confidence: 99%

Polarization degenerate solid-state cavity quantum electrodynamics

et al. 2015

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“…Thus, single-shot or time-resolved Kerr rotation measurements [22] as opposed to the time-averaged experiment shown here, would allow observation of the maximum φ = π phase shift achievable with this particular QD-cavity combination. This should enable us to generate spin-photon entanglement within the spin coherence time with a 50% probability, compared to 0.003% in the current state of the art [31]. Hence efficient spin-photon entanglement using such a low-Q-factor design is indeed feasible.…”

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Charged quantum dot micropillar system for deterministic light-matter interactions

et al. 2016

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Quantum dots (QDs) are semiconductor nanostructures in which a three-dimensional potential trap produces an electronic quantum confinement, thus mimicking the behavior of single atomic dipole-like transitions. However, unlike atoms, QDs can be incorporated into solid-state photonic devices such as cavities or waveguides that enhance the light-matter interaction. A near unit efficiency light-matter interaction is essential for deterministic, scalable quantum-information (QI) devices. In this limit, a single photon input into the device will undergo a large rotation of the polarization of the light field due to the strong interaction with the QD. In this paper we measure a macroscopic (∼6• ) phase shift of light as a result of the interaction with a negatively charged QD coupled to a low-quality-factor (Q ∼ 290) pillar microcavity. This unexpectedly large rotation angle demonstrates that this simple low-Q-factor design would enable near-deterministic light-matter interactions. DOI: 10.1103/PhysRevB.93.241409 The deterministic, lossless exchange of energy between charged QDs and single photons has been shown as the potential building block for a full range of components required for QI and quantum communication [1][2][3]. A deterministic light-matter interaction would give one the ability to both switch the photon state with a high fidelity as well as keep photon loss near zero (high efficiency). To achieve these simultaneously, it is essential that all the photon energy that couples to and from the quantum emitter must do so almost exclusively within a well-defined electromagnetic mode, where one can input/collect single photons. Input/output coupling efficiency is parametrized by the β factor, the ratio between the rate of coupling of the dipole to this well-defined mode compared to the total coupling rate of the dipole to all available electromagnetic modes, including leaky ones.Great success has been had in approaching this limit in several systems, including photonic crystal (PC) waveguides [4] and photonic nanowires [5]. For optical cavities, however, this limit has proven difficult to approach. Light-matter interaction strengths in the "strong coupling" regime have been achieved for high-Q-factor pillar microcavities [6] and in photonic crystal cavities [7], and could show high fidelity switching. However, the input/output mode is usually not well defined in high-Q-factor cavities: the escape rate to and from a well-defined input channel is similar to the escape rate to leaky cavity modes (CMs). These leaky modes arise either from the intrinsic design of the structure or from fabrication imperfections, putting a limit on the efficiency of high-Qfactor microcavities where the escape rate into the input/output mode is slow by design. However, in a low-Q-factor pillar the cavity lifetime is very short. Thus one may easily design a high-β-factor structure with a well-defined input/output mode, a crucial advantage [8].The β factor is directly linked to the competition between the rates of coherent and incohere...

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“…Indeed, many quantum optical experiments have recently been performed that exploit these atom-like properties; specific examples including deterministic single [11][12][13]. Moreover, in cavity QED experiments [14] remarkable effects such as photonblockade or photon-tunneling have opened the way to exploit QDs to generate novel quantum states of light [15].…”

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Dissipative preparation of the exciton and biexciton in self-assembled quantum dots on picosecond time scales

Ardelt

Hanschke²,

Fischer³

et al. 2014

Phys. Rev. B

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Pulsed resonant fluorescence is used to probe ultrafast phonon-assisted exciton and biexciton preparation in individual self-assembled InGaAs quantum dots. By driving the system using large area (≥ 10π) near resonant optical pulses, we experimentally demonstrate how phonon mediated dissipation within the manifold of dressed excitonic states can be used to prepare the neutral exciton with a fidelity ≥ 70%. By comparing the phonon-assisted preparation with resonant Rabi oscillations we show that the phonon-mediated process provides the higher fidelity preparation for large pulse areas and is less sensitive to pulse area variations. Moreover, by detuning the laser with respect to the exciton transition we map out the spectral density for exciton coupling to the bulk LA-phonon continuum. Similar phonon mediated processes are shown to facilitate direct biexciton preparation via two photon biexciton absorption, with fidelities > 80%. Our results are found to be in very good quantitative agreement with simulations that model the quantum dot-phonon bath interactions with Bloch-Redfield theory.Due to their discrete electronic structure and strong interaction with light, self-assembled quantum dots (QDs) are often described as artificial atoms in the solid state. Indeed, many quantum optical experiments have recently been performed that exploit these atom-like properties; specific examples including deterministic single [11][12][13]. Moreover, in cavity QED experiments [14] remarkable effects such as photonblockade or photon-tunneling have opened the way to exploit QDs to generate novel quantum states of light [15]. In all these experiments, the solid state environment of the QDs manifests itself primarily in coupling to acoustic phonons -an effect that is unwanted since it results in decoherence of the quantum state, particular examples include incoherent population transfer between a QD and a detuned microcavity mode [16] or intra-molecular tunneling in vertically stacked QD-molecules [17,18]. Moreover, in coherent optical exciton control experiments, coupling to acoustic phonons dominates the damping of Rabi oscillations [19,20], limiting state preparation and control fidelities and the scope for possible applications. However, in other cases the coupling to acoustic phonons was exploited instead, e.g. for the high-fidelity spin initialisation by tunnel ionisation [21] or for achieving population inversion in electrically driven quantum dots [22]. Recently, Glässl et al. [23] proposed that high-fidelity preparation of excitonic states could be achieved by exploiting the coupling of the dressed excitonic states to a quasi continuum of vibrational modes. Their approach involves to combining the relative advantages of both Rabi oscillations and rapid adiabatic passage [24,25] by making use of phonon-mediated relaxation in the presence of a strong, near resonant pulsed optical field.In this paper we investigate the phonon-assisted preparation of neutral exciton (X 0 ) and biexciton (2X) states in QDs using pulsed resonant...

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Entanglement between a Quantum Dot Spin and a Photon

Cited by 26 publications

References 10 publications

Polarization degenerate solid-state cavity quantum electrodynamics

Polarization degenerate solid-state cavity quantum electrodynamics

Charged quantum dot micropillar system for deterministic light-matter interactions

Dissipative preparation of the exciton and biexciton in self-assembled quantum dots on picosecond time scales

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