Nature Search

Complete tomography of a high-fidelity solid-state entangled spin–photon qubit pair

Future quantum communication technologies require entanglement between stationary and flying qubits, in systems that are inherently scalable. To this end, De Greveet al.present full state tomography of a qubit pair formed by entangling a quantum dot spin and a photon, with a fidelity of over 90%.

Kristiaan De Greve
Peter L. McMahon
Yoshihisa Yamamoto
Research26 Jul 2013
Nature Communications

Volume: 4, P: 1-7
Industry-compatible silicon spin-qubit unit cells exceeding 99% fidelity

Two-qubit operations exceeding 99% fidelity have been demonstrated by silicon devices made with standard semiconductor tooling in a 300-mm foundry environment.

Paul Steinacker
Nard Dumoulin Stuyck
Andrew S. Dzurak
ResearchOpen Access24 Sept 2025
Nature

Volume: 646, P: 81-87
Excitons in a reconstructed moiré potential in twisted WSe₂/WSe₂ homobilayers

Scanning electron microscopy is used to image stacking domains in few-layer graphene, as well as moiré patterns in twisted van der Waals heterostructures, allowing for the correlation of the local structure with their excitonic properties.

Trond I. Andersen
Giovanni Scuri
Mikhail D. Lukin
Research04 Jan 2021
Nature Materials

Volume: 20, P: 480-487
Ultrafast optical spin echo in a single quantum dot

An ultrafast, all-optical spin echo technique is used to increase the decoherence time of a single quantum dot electron spin from nanoseconds to several microseconds. The ratio of decoherence time to gate time exceeds 10⁵, suggesting strong promise for future photonic quantum information processors and repeater networks.

David Press
Kristiaan De Greve
Yoshihisa Yamamoto
Research18 Apr 2010
Nature Photonics

Volume: 4, P: 367-370
Probing dark excitons in atomically thin semiconductors via near-field coupling to surface plasmon polaritons

Near-field coupling to surface plasmon polaritons enables the observation of spin-forbidden dark excitonic states in monolayer WSe₂.

You Zhou
Giovanni Scuri
Hongkun Park
Research26 Jun 2017
Nature Nanotechnology

Volume: 12, P: 856-860
Electrical control of charged carriers and excitons in atomically thin materials

Formation of a homogeneous two-dimensional electron gas in transition metal dichalcogenide heterostructures allows for efficient electrical control of charge carriers and excitons.

Ke Wang
Kristiaan De Greve
Philip Kim
Research15 Jan 2018
Nature Nanotechnology

Volume: 13, P: 128-132
Controlled interlayer exciton ionization in an electrostatic trap in atomically thin heterostructures

Here, the authors use electrostatic gates to trap interlayer excitons (IE) in MoSe₂/WSe₂ heterobilayers. They observe an exponential broadening of the IE emission linewidth that signals the IE ionization threshold.

Andrew Y. Joe
Andrés M. Mier Valdivia
Philip Kim
ResearchOpen Access08 Aug 2024
Nature Communications

Volume: 15, P: 1-8
Ultrafast coherent control and suppressed nuclear feedback of a single quantum dot hole qubit

Electron spin in quantum dots are extensively studied as a qubit for quantum information processing. However, the coherence of electron spin is deleteriously influenced by nuclear spin. Quantum-dot holes are a potential alternative. Full control over hole-spin qubits is now achieved using picosecond lasers.

Kristiaan De Greve
Peter L. McMahon
Yoshihisa Yamamoto
Research28 Aug 2011
Nature Physics

Volume: 7, P: 872-878
Quantum-dot spin–photon entanglement via frequency downconversion to telecom wavelength

Entanglement of the spin of an electron in a semiconductor quantum dot with a single photon is reported, and verified by means of time-resolved frequency downconversion to a telecommunications wavelength; this process is an essential requirement for future quantum networks.

Kristiaan De Greve
Leo Yu
Yoshihisa Yamamoto
Research14 Nov 2012
Nature

Volume: 491, P: 421-425
Industrial 300 mm wafer processed spin qubits in natural silicon/silicon-germanium

Thomas Koch
Clement Godfrin
Wolfgang Wernsdorfer
ResearchOpen Access05 Apr 2025
npj Quantum Information

Volume: 11, P: 1-7

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