Adiabatic optical entanglement between electron spins in separate quantum dots

Abstract

We present an adiabatic approach to the design of entangling quantum operations with two electron spins localized in separate InAs/GaAs quantum dots via the Coulomb interaction between optically-excited localized states. Slowly-varying optical pulses minimize the pulse noise and the relaxation of the excited states. An analytic "dressed state" solution gives a clear physical picture of the entangling process, and a numerical solution is used to investigate the error dynamics. For two vertically-stacked quantum dots we show that, for a broad range of dot parameters, a two-spin state with concurrence $C>0.85$ can be obtained by four optical pulses with durations $\sim 0.1-1$ ns.

7 pages, 5 figures

References in corpus (18)

• Entanglement of Formation of an Arbitrary State of Two Qubits
• Quantum Computation with Quantum Dots
• A Quantum Adiabatic Evolution Algorithm Applied to Random Instances of an NP-Complete Problem
• Fast quantum gates for neutral atoms
• Driven coherent oscillations of a single electron spin in a quantum dot
• Complete Characterization of a Quantum Process: the Two-Bit Quantum Gate
• Spin-based all-optical quantum computation with quantum dots: understanding and suppressing decoherence
• Observation of Faraday rotation from a single confined spin
• Optical RKKY Interaction between Charged Semiconductor Quantum Dots
• Qubit Rotation by STIRAP
• Electro-optical properties of semiconductor quantum dots: Application to quantum information processing
• Photon statistics from coupled quantum dots
• Quantum computers based on electron spins controlled by ultra-fast, off-resonant, single optical pulses
• Fast initialization of the spin state of an electron in a quantum dot in the Voigt configuration
• Photoluminescence Spectroscopy of the Molecular Biexciton in Vertically Stacked Quantum Dot Pairs
• Optically-controlled logic gates for two spin qubits in vertically-coupled quantum dots
• Optically-controlled single-qubit rotations in self-assembled InAs quantum dots
• Quantum Computing with Spin Qubits Interacting Through Delocalized Excitons: Overcoming Hole Mixing

Cited by in corpus (6)

• Quantum computing by optical control of electron spins
• Quantum state preparation in semiconductor dots by adiabatic rapid passage
• Lindblad theory of dynamical decoherence of quantum-dot excitons
• Creation of entangled states in coupled quantum dots via adiabatic rapid passage
• All-optical controlled phase gate in quantum dot molecules
• Coulomb correlations of a few body system of spatially separated charges