Detecting entanglement using a double quantum dot turnstile

Abstract

We propose a scheme based on using the singlet ground state of an electron spin pair in a double quantum dot nanostructure as a suitable set-up for detecting entanglement between electron spins via the measurement of an optimal entanglement witness. Using time-dependent gate voltages and magnetic fields the entangled spins are separated and coherently rotated in the quantum dots and subsequently detected at spin-polarized quantum point contacts. We analyze the coherent time evolution of the entangled pair and show that by counting coincidences in the four exits an entanglement test can be done. This set-up is close to present-day experimental possibilities and can be used to produce pairs of entangled electrons ``on demand''.

5 pages, 2 figures - published version

References in corpus (27)

• Single-shot read-out of an individual electron spin in a quantum dot
• Coupled quantum dots as quantum gates
• Andreev-Tunneling, Coulomb Blockade, and Resonant Transport of Non-Local Spin-Entangled Electrons
• Few-Electron Quantum Dot Circuit with Integrated Charge Read-Out
• The Addition Spectrum of a Lateral Dot from Coulomb and Spin Blockade Spectroscopy
• Electronic Entanglement in the Vicinity of a Superconductor
• Detection of entanglement with few local measurements
• Two-particle Aharonov-Bohm effect and Entanglement in the electronic Hanbury Brown Twiss setup
• Probing Entanglement and Non-locality of Electrons in a Double-Dot via Transport and Noise
• Electron spin evolution induced by interaction with nuclei in a quantum dot
• Noise of Entangled Electrons: Bunching and Antibunching
• Orbital entanglement and violation of Bell inequalities in mesoscopic conductors
• Bell inequalities and entanglement in solid state devices
• Production and detection of entangled electron-hole pairs in a degenerate electron gas
• Real-time detection of single electron tunneling using a quantum point contact
• Quantum entanglement in carbon nanotubes
• Hyperfine-mediated transitions between a Zeeman split doublet in GaAs quantum dots: The role of the internal field
• Superconductor coupled to two Luttinger liquids as an entangler for electron spins
• Electron Entanglement via a Quantum Dot
• Detecting Spin-Polarized Currents in Ballistic Nanostructures
• Single Spin Dynamics and Decoherence in a Quantum Dot via Charge Transport
• Spin and Polarized Current from Coulomb Blockaded Quantum Dots
• Semiconductor few-electron quantum dot operated as a bipolar spin filter
• Impurity Scattering Induced Entanglement of Ballistic Electrons
• Double quantum dot turnstile as an electron spin entangler
• Non-Perturbative Bounds on Hyperfine-Induced Electron Spin Coherence Times
• Analytical solution of the time evolution of an entangled electron spin pair in a double quantum dot nanostructure

Cited by in corpus (27)

• Quantum entanglement
• Driven coherent oscillations of a single electron spin in a quantum dot
• Multiparticle entanglement under the influence of decoherence
• Odd and even Kondo effects from emergent localisation in quantum point contacts
• Single-parameter quantum charge and spin pumping in armchair graphene nanoribbons
• Generating spin-entangled electron pairs in normal conductors using voltage pulses
• Entanglement distillation by adiabatic passage in coupled quantum dots
• Inducing spin-correlations and entanglement in a double quantum dot through non-equilibrium transport
• Effect of induced transition on the quantum entanglement and coherence in two-coupled double quantum dots system
• Detecting entanglement of two electron spin qubits with witness operators
• Generation of Spin Entanglement in Nonequilibrium Quantum Dots
• Majorana Entanglement Bridge
• Quenched dynamics of entangled states in correlated quantum dots
• Robust fermionic-mode entanglement of a nanoelectronic system in non-Markovian environments
• Entanglement detection for electrons via witness operators
• Local and nonlocal entanglement for quasiparticle pairs induced by Andreev reflection
• Decay of Entanglement for Solid-State Qubits
• Entanglement production in non-ideal cavities and optimal opacity
• Generation and detection of a spin entanglement in nonequilibrium quantum dots
• Generation of EPR pairs and interconversion of static and flying electron spin qubits
• Entanglement transfer from electrons to photons in quantum dots: An open quantum system approach
• AC transport in carbon-based devices: challenges and perspectives
• Decoherence of an entangled state of a strongly-correlated double quantum dot structure through tunneling processes
• Nuclear-induced time evolution of entanglement of two-electron spins in anisotropically coupled quantum dot
• Time evolution of an entangled initial state in coupled quantum dots with Coulomb correlations
• Control and manipulation of entanglement between two coupled qubits by fast pulses
• Entanglement Witnesses from Single-Particle Interference