Ultrafast optical control of entanglement between two quantum dot spins

Abstract

The interaction between two quantum bits enables entanglement, the two-particle correlations that are at the heart of quantum information science. In semiconductor quantum dots much work has focused on demonstrating single spin qubit control using optical techniques. However, optical control of entanglement of two spin qubits remains a major challenge for scaling from a single qubit to a full-fledged quantum information platform. Here, we combine advances in vertically-stacked quantum dots with ultrafast laser techniques to achieve optical control of the entangled state of two electron spins. Each electron is in a separate InAs quantum dot, and the spins interact through tunneling, where the tunneling rate determines how rapidly entangling operations can be performed. The two-qubit gate speeds achieved here are over an order of magnitude faster than in other systems. These results demonstrate the viability and advantages of optically controlled quantum dot spins for multi-qubit systems.

24 pages, 5 figures

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Cited by in corpus (96)

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• Two-qubit Gate of Combined Single Spin Rotation and Inter-dot Spin Exchange in a Double Quantum Dot
• Phase-tuned entangled state generation between distant spin qubits
• A quantum logic gate between a solid-state quantum bit and a photon
• Optical Interferometry with Quantum Networks
• One-way quantum repeater based on near-deterministic photon-emitter interfaces
• Optical control of one and two hole spins in interacting quantum dots
• Demonstration of quantum entanglement between a single electron spin confined to an InAs quantum dot and a photon
• Quantum control of a spin qubit coupled to a photonic crystal cavity
• Coupled Colloidal Quantum Dot Molecules
• Circuit QED with Hole-Spin Qubits in Ge/Si Nanowire Quantum Dots
• Deterministic generation of all-photonic quantum repeaters from solid-state emitters
• Coherent optical control of the spin of a single hole in a quantum dot
• Tensor networks and the numerical renormalization group
• Deterministic generation of large-scale entangled photonic cluster state from interacting solid state emitters
• Cavity-stimulated Raman emission from a single quantum dot spin
• Scalable qubit architecture based on holes in quantum dot molecules
• Coherent spin dynamics of electrons and excitons in nanostructures
• Resource requirements for efficient quantum communication using all-photonic graph states generated from a few matter qubits
• Controlling Coherent Quantum Dot Interactions
• Complete control of a matter qubit using a single picosecond laser pulse
• A 3D topological insulator quantum dot for optically controlled quantum memory and quantum computing
• Two-Qubit Couplings of Singlet-Triplet Qubits Mediated by One Quantum State
• Open quantum system description of singlet-triplet qubits in quantum dots
• Open quantum system description of singlet-triplet qubits in quantum dots
• High fidelity optical preparation and coherent Larmor precession of a single hole in an InGaAs quantum dot molecule
• Electron states in a double quantum dot with broken axial symmetry
• Photon echo transients from an inhomogeneous ensemble of semiconductor quantum dots
• Multidimensional cluster states using a single spin-photon interface coupled strongly to an intrinsic nuclear register
• All optical quantum control of a spin-quantum state and ultrafast transduction into an electric current
• Strong Hyperfine-Induced Modulation of an Optically-Driven Hole Spin in an InAs Quantum Dot
• Charge control in laterally coupled double quantum dots
• High fidelity quantum gates via analytically solvable pulses
• Hyperfine interaction induced dephasing of coupled spin qubits in semiconductor double quantum dots
• Persistent narrowing of nuclear-spin fluctuations in InAs quantum dots using laser excitation
• Two-Photon Excitation Spectroscopy of Silicon Quantum Dots and Ramifications for Bio-Imaging
• Creation of entangled states in coupled quantum dots via adiabatic rapid passage
• Effect of detuning on the phonon induced dephasing of optically driven InGaAs/GaAs quantum dots
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• Fast Two-Qubit Gates in Semiconductor Quantum Dots using a Photonic Microcavity
• All-optical controlled phase gate in quantum dot molecules
• Deterministic entanglement between a propagating photon and a singlet--triplet qubit in an optically active quantum dot molecule
• Optical control of coherent interactions between quantum dot electron spins
• Longitudinal wave function control in single quantum dots with an applied magnetic field
• Teleporting quantum information encoded in fermionic modes
• Initialization of a spin qubit in a site-controlled nanowire quantum dot
• Optically controlled phase gate for two spin qubits in coupled quantum dots
• Analytical study of spin-dependent transition rates within pairs of dipolar and strongly exchange coupled spins with (S = 1/2) during magnetic resonant excitation
• Suppression of Decoherence tied to Electron-Phonon Coupling in Telecom-Compatible Quantum Dots: Low-threshold Reappearance Regime for Quantum State Inversion
• Quantum dot molecule devices with optical control of charge status and electronic control of coupling
• Frequency-encoded linear cluster states with coherent Raman photons
• Optical measurement and modeling of interactions between two hole or two electron spins in coupled InAs quantum dots
• Equilibration in closed quantum systems: Application to spin qubits
• Spin noise spectroscopy of quantum dot molecules
• Controlling the nuclear polarization in quantum dots using optical pulses with a modest bandwidth
• Emission spectrum of quasi-resonant laterally coupled quantum dots
• Controlled Coherent Coupling in a Quantum Dot Molecule Revealed by Ultrafast Four-Wave Mixing Spectroscopy
• Ultra-short strong excitation of two-level systems
• Twisting enabled charge transfer excitons in epitaxially fused quantum dot molecules
• Inter-dot coupling and excitation transfer mechanisms of telecommunication band InAs quantum dots at elevated temperatures
• Optically Loaded Semiconductor Quantum Memory Register
• Towards Quantum Repeaters with Solid-State Qubits: Spin-Photon Entanglement Generation using Self-Assembled Quantum Dots
• Long-living dark coherence brought to light by magnetic-field controlled photon echo
• Subpicosecond $X$ rotations of atomic clock states
• Ramsey fringes in a room temperature quantum dot semiconductor optical amplifier
• An unconventional geometric phase gate with two nonresonant quantum dots trapped in a photonic crystal cavity
• Single-shot readout of a solid-state spin in a decoherence-free subspace
• Tunneling induced dark states and controllable fluorescence spectrum in quantum-dot molecules
• Scattering of charged particles on two spatially separated time-periodic optical fields
• Nonmonotonic buildup of spin-singlet correlations in a double quantum dot
• Coupling Perovskite Quantum Dot Pairs in Solution using Nanoplasmonic Assembly
• Accurate and efficient description of interacting carriers in quantum nanostructures by selected configuration interaction and perturbation theory
• GHz bandwidth electro-optics of a single self-assembled quantum dot in a charge-tunable device
• Excitation spectrum as a resource for efficient two-qubit entangling gates
• The magneto-optics in quantum wires comprised of vertically stacked quantum dots: A calling for the magnetoplasmon qubits
• Direct Excitation of a Single Quantum Dot with Cavity-SPDC Photons
• Spectral broadening of optical transitions at tunneling resonances in InAs/GaAs coupled quantum dot pairs
• Rapid creation of distant entanglement by multiphoton resonant fluorescence
• Enhanced solar photocurrent using a quantum dot molecule
• Coherence limitations in the optical control of the singlet-triplet qubit in a quantum dot molecule
• Silicon T centre hyperfine structure and memory protection schemes
• Single-particle and collective excitations in quantum wires comprised of vertically stacked quantum dots: Finite magnetic field
• Trions Stimulate Electronic Coupling in Colloidal Quantum Dot Molecules
• Molecular Processes as Quantum Information Resources
• Retardation of entanglement decay of two spin qubits by quantum measurements
• A coupled quantum dot laser amplifier: Raman transitions between spin singlet and triplet states
• Localized all-optical control of single semiconductor quantum dots through plasmon-polariton-induced screening
• Optical signatures of spin dependent coupling in semimagnetic quantum dot molecules