Generation of heralded entanglement between distant hole spins

  title={Generation of heralded entanglement between distant hole spins},
  author={Aymeric Delteil and Sun Zhe and Wei-bo Gao and Emre Togan and S. Faelt and Ataç Imamoğlu},
  journal={Nature Physics},
The detection of a single photon heralds the projection of two remote spins onto a maximally entangled state. This has been demonstrated for quantum-dot hole spins, featuring a fast generation rate that could enable quantum technology applications. 

Entanglement Generation Based on Quantum Dot Spins

Quantum correlations between a confined spin and a propagating single photon can be used to entangle distant spins. In this chapter, we review recent progress in the field culminating in the

Screening nuclear field fluctuations in quantum dots for indistinguishable photon generation

Screening of the nuclear field fluctuations is demonstrated to successfully generate indistinguishable single photons in resonance fluorescence spectroscopy and two-photon interference experiments.

Manipulation of multipartite entanglement in an array of quantum dots.

This work studies how the W state and W-like state may be generated in a quantum-dot array by controlling the coupling between an incident photon and the quantum dots on a waveguide.

A long-lived spin qubit in an optically active semiconductor quantum dot

We report on the first s pin-control e xperiments i n o ptically active GaAs/AlGaAs quantum dots. Using dynamic decoupling, we retain a quantum superposition for up to 105 µs, a hundred-fold

One-Way Quantum Repeater Based on Near-Deterministic Photon-Emitter Interfaces

A proposed protocol for a one-way quantum repeater could enable robust long-distance quantum communication with significantly fewer resources than other proposals.

Heralded Distribution of Single-Photon Path Entanglement.

The experimental realization of heralded distribution of single-photon path entanglement at telecommunication wavelengths in a repeater-like architecture is reported, paving the way towards high-rate and practical quantum repeater architectures.

Quantum Networks with Deterministic Spin–Photon Interfaces

This report considers how recent experimental progress on deterministic solid‐state spin–photon interfaces enables the construction of a number of key elements of quantum networks. After reviewing

Photon-Mediated Quantum Information Processing with Neutral Atoms in an Optical Cavity

In this dissertation, the common coupling of two atomic qubits to the mode of an optical cavity is studied. Reflection of light pulses from the coupled atom-atom-cavity system and their subsequent

Quantum Tomography of Entangled Spin-Multiphoton States

We present a novel method for quantum tomography of multi-qubit states. We apply the method to spin-multi-photon states, which we produce by periodic excitation of a semiconductor quantumdotconfined

Realization of a Cascaded Quantum System: Heralded Absorption of a Single Photon Qubit by a Single-Electron Charged Quantum Dot.

This work demonstrates the heralded absorption of a single photonic qubit, generated by a single neutral quantum dot, by asingle-electron charged quantum dot that is located 5 m away and shows that this process can be combined with local operations optically performed on the destination node by measuring classical correlations between the absorbed photon color and the final state of the electron spin.



Optical control of one and two hole spins in interacting quantum dots

Researchers demonstrate fast, single-qubit gates using a sequence of 13 ps pulses. Two vertically stacked InAs/GaAs quantum dots were coupled through coherent tunnelling and charged with controlled

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

Creation of entangled states of distant atoms by interference

We propose a scheme to create distant entangled atomic states. It is based on driving two (or more) atoms with a weak laser pulse, so that the probability that two atoms are excited is negligible. If

Atom-atom entanglement by single-photon detection.

A scheme for entangling distant atoms is realized, based on quantum interference and detection of a single photon scattered from two effectively one meter distant laser cooled and trapped atomic ions, with high rate and with a fidelity limited mostly by atomic motion.

Heralded entanglement between solid-state qubits separated by three metres

Long-distance entanglement of two electron spin qubits in diamond with a spatial separation of three metres is established using a robust protocol based on creation of spin–photonEntanglement at each location and a subsequent joint measurement of the photons.

Coherent two-electron spin qubits in an optically active pair of coupled InGaAs quantum dots.

Using coherent population trapping, this work generates a coherent superposition of the singlet and triplet states of an optically active quantum dot molecule, and shows that the corresponding T2* may exceed 200 ns.

Observation of entanglement between a quantum dot spin and a single photon

The observation of quantum entanglement between a semiconductor quantum dot spin and the colour of a propagating optical photon constitutes a first step towards implementation of a quantum network with nodes consisting of semiconductor spin quantum bits.

Heralded Entanglement Between Widely Separated Atoms

The creation and analysis of heralded entanglement between spins of two single rubidium-87 atoms trapped independently 20 meters apart is reported on, illustrating the viability of an integral resource for quantum information science, as well as for fundamental tests of quantum mechanics.

Fault-tolerant quantum communication based on solid-state photon emitters.

A novel protocol for a quantum repeater that enables long-distance quantum communication through realistic, lossy photonic channels by incorporating active purification of arbitrary errors at each step of the protocol using only two qubits at each repeater station.

Demonstration of quantum entanglement between a single electron spin confined to an InAs quantum dot and a photon.

An all optical experimental demonstration of quantum entanglement between a single electron spin confined to a single charged semiconductor quantum dot and the polarization state of a photon spontaneously emitted from the quantum dot's excited state is reported.