Nondestructive Real-Time Measurement of Charge and Spin Dynamics of Photoelectrons in a Double Quantum Dot

Fujita, Takafumi; Kiyama, H.; Morimoto, Keiko; Teraoka, S.; Allison, Giles; Ludwig, Arne; Wieck, A. D.; Oiwa, A.; Tarucha, Seigo

doi:10.1103/physrevlett.110.266803

Cited by 30 publications

(34 citation statements)

References 18 publications

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“…The incident photon flux along the horizontal axis is determined by estimating the number of photons incident on the dot through the aperture mask (see the supplementary information in ref. 9). For both methods, we observe a monotonic increase of the counting probability with increasing incident photon flux as critical evidence that the observed photon response indeed arises from photogenerated electrons in the dot.…”

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confidence: 57%

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Single photoelectron detection after selective excitation of electron heavy-hole and electron light-hole pairs in double quantum dots

et al. 2014

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The rapid escalation of information processing and storage in the last decade has necessitated the development of novel technologies to ensure highly secured long distance communication. With recent advances in theoretical and experimental studies, quantum information is believed to be a potential candidate for future technology with absolutely secure information exchange. Major challenges in quantum information systems include long distance communication and multi-node networks, which require coherent coupling of photons to solid-state quantum bits (qubits) as used for implementing quantum memory and quantum entanglement. They are both fundamental elements for constructing a quantum repeater, distributed quantum computing and hybrid quantum information network [1].A noticeable proposal for the coherent transfer from photon-polarization qubits to electron spin qubits based on the optical selection rule [2] has been experimentally demonstrated for an ensemble of photons and electrons in g-factor engineered GaAs quantum well (QW) systems [3,4]. However, practical use of a quantum information network requires quantum state transfer from a single photon to a single electron spin, which is feasible in a quantum dot (QD) with three-dimensionally confined electrons [5][6][7]. Electrically gated QDs have an advantage that the confined electron spin can be manipulated and detected for making various kinds of qubit gates. In this context electron spin is an appropriate partner for photons. For the first step toward the verification of coherent transfer between single quanta, A. Pioda et al. [8] realized the real-time detection of trapping and resetting of single photogenerated electrons using a nearby quantum point contact (QPC) as a charge sensor. The change of electron number in the single QD was clearly monitored by measuring the change of the QPC conductance when the photogenerated electron escaped from the dot. The authors proved that the photoelectron trapping can be electrically detected within a time significantly shorter than the spin-flip time T 1 . This technique was later extended to double QDs (DQDs) and the improved ability to detect single photoelectrons as well as their spin orientations through inter-dot tunneling has been demonstrated [9]. Note in DQDs spin-related phenomena such as Pauli spin blockade, and electron spin resonance can be utilized for nondestructive spin readout, and coherent spin rotation, respectively [10][11][12][13].Despite the previous innovative results, those samples are not suitable for coherent transfer. The proposed coherent transfer scheme postulates specified systems like QWs with a GaAs well between two AlGaAs barriers. The heavy and light hole bands are energetically separated in the QW and the electron and light hole g-factors can be tuned to satisfy the condition of coherent photon to spin information transfer: 2,4]. Here, g e , and g lh are the g-factors of conduction band electron, and valence band light hole, respectively,  B the Bohr magneton, and E ph the photon ene...

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confidence: 57%

“…Only the 'IB' method was studied in our previous work [9] but here we find that the 'IR' method enables robust and nondestructive single photon detection as well.…”

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confidence: 72%

Single photoelectron detection after selective excitation of electron heavy-hole and electron light-hole pairs in double quantum dots

et al. 2014

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“…Several pioneering works using liquid crystals [5], polymers [6,7], metals [8][9][10], and dielectrics [8] have been reported. Semiconductor-based 3D chiral structures can be useful for applications such as highly efficient lasers emitting CP light and spin-photon interfaces [11][12][13][14], since it is possible in semiconductor systems to easily introduce photon emitters and to manipulate electron/hole spins confined in nanostructures. However, fabrication difficulty has largely limited the progress on semiconductor-based 3D chiral structures.…”

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confidence: 99%

Giant optical rotation in a three-dimensional semiconductor chiral photonic crystal

Takahashi¹,

Tandaechanurat²,

Igusa³

et al. 2013

Opt. Express

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Optical rotation is experimentally demonstrated in a semiconductor-based three-dimensional chiral photonic crystal (PhC) at a telecommunication wavelength. We design a rotationally-stacked woodpile PhC structure, where neighboring layers are rotated by 45° and four layers construct a single helical unit. The mirror-asymmetric PhC made from GaAs with sub-micron periodicity is fabricated by a micro-manipulation technique. The linearly polarized light incident on the structure undergoes optical rotation during transmission. The obtained results show good agreement with numerical simulations. The measurement demonstrates the largest optical rotation angle as large as ∼ 23° at 1.3 μm wavelength for a single helical unit.

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“…Tomographic Kerr measurements were also performed for Zeeman-resolved LH excitons but only for large ensembles in GaAs quantum wells (QWs) [3,4]. Recently, photo-generation of a single electron in a laterally gated quantum dot (QD) has been achieved but featured neither the LH excitation norspin readout [5][6][7][8][9]. To demonstrate the photon-to-spin quantum state transfer requires challenging experiments to directly read out the spin state of the photo-generated electron via the spin-resolved LH excitation.…”

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confidence: 99%

Photogeneration of a single electron from a single Zeeman-resolved light-hole exciton with preserved angular momentum

et al. 2019

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Quantum state transfer from a single photon to a single electron following selection rule can only occur for a spin-resolved light hole excitation in GaAs quantum dots; However, these phenomena are yet to be experimentally realized. Here, we report on single shot readout of a single electron spin via the Zeeman-resolved light hole excitation using an optical spin blockade method in a GaAs quantum dot and a Pauli spin blockade method in a double GaAs quantum dot. The observed photo-excitation probability strongly depends on the photon polarization, an indication of angular momentum transfer from a single photon to an electron. Our demonstration will open a pathway to further investigation of fundamental quantum physics and applications of quantum networking technology.

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Nondestructive Real-Time Measurement of Charge and Spin Dynamics of Photoelectrons in a Double Quantum Dot

Cited by 30 publications

References 18 publications

Single photoelectron detection after selective excitation of electron heavy-hole and electron light-hole pairs in double quantum dots

Single photoelectron detection after selective excitation of electron heavy-hole and electron light-hole pairs in double quantum dots

Giant optical rotation in a three-dimensional semiconductor chiral photonic crystal

Photogeneration of a single electron from a single Zeeman-resolved light-hole exciton with preserved angular momentum

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