Semiconductor qubits based on fluorine implanted ZnMgSe/ZnSe quantum-well nanostructures

Kim, Y. M.; Sleiter, D.; Sanaka, Kaoru; Yamamoto, Yoshihisa; Meijer, Jan; Lischka, K.; Pawlis, A.

doi:10.1103/physrevb.85.085302

Cited by 15 publications

(14 citation statements)

References 32 publications

(34 reference statements)

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“…The spin of a donor-bound electron in fluorine-doped ZnSe represents a promising system for quantum information technologies. So far emission of indistinguishable single photons [1], photon entanglement [2] and optical control of single electron spins [3][4][5] were achieved. Studies of the electron spin dynamics of an ensemble of donorbound electrons demonstrated a spin dephasing time T * 2 of 33 ns and a longitudinal spin relaxation time T 1 of 1.6 µs [6,7].…”

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confidence: 99%

Dynamics of nuclear spin polarization induced and detected by coherently precessing electron spins in fluorine-doped ZnSe

et al. 2016

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We study the dynamics of optically-induced nuclear spin polarization in a fluorine-doped ZnSe epilayer via time-resolved Kerr rotation. The nuclear polarization in the vicinity of a fluorine donor is induced by interaction with coherently precessing electron spins in a magnetic field applied in the Voigt geometry. It is detected by nuclei-induced changes in the electron spin coherence signal. This all-optical technique allows us to measure the longitudinal spin relaxation time T1 of the 77 Se isotope in a magnetic field range from 10 to 130 mT under illumination. We combine the optical technique with radio frequency methods to address the coherent spin dynamics of the nuclei and measure Rabi oscillations, Ramsey fringes and the nuclear spin echo. The inhomogeneous spin dephasing time T * 2 and the spin coherence time T2 of the 77 Se isotope are measured. While the T1 time is on the order of several milliseconds, the T2 time is several hundred microseconds. The experimentally determined condition T1 ≫ T2 verifies the validity of the classical model of nuclear spin cooling for describing the optically-induced nuclear spin polarization.

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Dynamics of nuclear spin polarization induced and detected by coherently precessing electron spins in fluorine-doped ZnSe

et al. 2016

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“…The latter technique was performed at an acceleration voltage of 24 keV to achieve an implantation profile with its maximum in the QW centre. After implantation a well defined annealing procedure was applied to the sample to recover local structural damage [5]. While the epitaxial -doping favorites a well defined placement of the F-donors in the QW centre, the lateral distribution is statistically and due to the ZnF 2 evaporation source a small probability remains to form fluorine complexes in the QW as well.…”

Section: Methodsmentioning

confidence: 99%

“…electronic and energetic structure) due to their natural imprinted size distribution, when fabricated with present material growth techniques. In contrast, single impurities in semiconductors may bridge the gap between "real" and "artificial atoms", because they provide identical atomic properties and can be easily integrated in the semiconductor by doping [4] or ion implantation [5] methods.…”

Section: Introductionmentioning

confidence: 99%

Donor bound excitons in ZnSe nanoresonators - Applications in quantum information science

Pawlis

Lischka

Sanaka

et al. 2014

AIP Conference Proceedings

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Free and bound states of excitons in a percolation cluster of ZnSe quantum dots in a dielectric matrix Low Temp.Localization and thermal escape of excitons in ultrathin ZnSe/ZnS single quantum wells linked to interfacial ZnSe quantum slabs Abstract. Here we summarize the advantages of excitons bound to isolated fluorine donor in ZnSe/ZnMgSe quantum well nano-structures. Devices based on these semiconductors, are particularly suited to implement concepts of the optical manipulation of quantum states in solidstate material. The fluorine donor in ZnSe provides a physical qubit with potential advantages over previously researched qubits. In this context we show several initial demonstrations of devices, such as a low-threshold microdisk laser and an indistinguishable single photon source. Additionally we demonstrate the realization of a controllable three-level-system qubit consisting of a single Fluorine donor in a ZnSe nano-pillar, which provides an optical accessible single electon spin qubit.

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“…However, many qubit systems, especially solid-state qubit systems, do not possess a good cycling transition due to non-radiative decay mechanisms or selection rules. These qubit systems include quantum dot spins [63], fluorine impurities in CdTe [117], and silicon vacancy centers [118,119].…”

Section: Discussionmentioning

confidence: 99%

Nanophotonic Quantum Interface for a Single Solid-state Spin

Sun

Kim

Solomon

et al. 2016

Conference on Lasers and Electro-Optics

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The ability to store and transmit quantum information plays a central role in virtually all quantum information processing applications. Single spins serve as pristine quantum memories whereas photons are ideal carriers of quantum information. Strong interactions between these two systems provide the necessary interface for developing future quantum networks and distributed quantum computers.They also enable a broad range of critical quantum information functionalities such as entanglement distribution, non-destructive quantum measurements and strong photon-photon interactions. Realizing spin-photon interactions in a solid-state device is particularly desirable because it opens up the possibility of chip-integrated quantum circuits that support gigahertz bandwidth operation.In this thesis, I demonstrate a nanophotonic quantum interface between a single solid-state spin and a photon, and explore its applications in quantum information processing. First, we experimentally realize a spin-photon quantum phase switch based on a strongly coupled quantum dot and photonic crystal cavity system. This device enables coherent light-matter interactions at the fundamental limit, where a single spin controls the polarization of a photon and a single photon flips the spin state. Furthermore, we theoretically propose a way to deterministically generate spin-photon entanglement based on the spin-photon quantum interface, which is an important step towards solid-state implementations of quantum repeaters and quantum networks. Next, we show both theoretically and experimentally, a new method to optically read out a solid-state spin based on the same cavity quantum electrodynamics (QED) system. This new method achieves significant improvement in spin readout fidelity over typical approaches using fluorescence light detection.In the end, we report efforts to realize tunable and robust quantum dot based cavity QED systems. We present a technique for tuning the frequency of a quantum dot that is strongly coupled to a photonic crystal cavity by applying strain. This tuning technique enables us to accurately control the detuning between a quantum dot and a cavity without affecting other emission properties of the dot, which is essential for lots of applications associated with cavity QED systems, including non-classical light generation, photon blockade, single photon level optical switch, and also our major focus, the spin-photon quantum interface.

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Semiconductor qubits based on fluorine implanted ZnMgSe/ZnSe quantum-well nanostructures

Cited by 15 publications

References 32 publications

Dynamics of nuclear spin polarization induced and detected by coherently precessing electron spins in fluorine-doped ZnSe

Dynamics of nuclear spin polarization induced and detected by coherently precessing electron spins in fluorine-doped ZnSe

Donor bound excitons in ZnSe nanoresonators - Applications in quantum information science

Nanophotonic Quantum Interface for a Single Solid-state Spin

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