Optical Quantum Computation with Perpetually Coupled Spins

Abstract

The possibility of using strongly and continuously interacting spins for quantum computation has recently been discussed. Here we present a simple optical scheme that achieves this goal while avoiding the drawbacks of earlier proposals. We employ a third state, accessed by a classical laser field, to create an effective barrier to information transfer. The mechanism proves to be highly efficient both for continuous and pulsed laser modes; moreover it is very robust, tolerating high decay rates for the excited states. The approach is applicable to a broad range of systems, in particular dense structures such as solid state self-assembled (e.g., molecular) devices. Importantly, there are existing structures upon which `first step' experiments could be immediately performed.

5 pages including 3 figures. Updated to published version

References in corpus (14)

• Zeeman energy and spin relaxation in a one-electron quantum dot
• From the quantum Zeno to the inverse quantum Zeno effect
• Tunable Non-local Spin Control in a Coupled Quantum Dot System
• Spin-based all-optical quantum computation with quantum dots: understanding and suppressing decoherence
• Transition between Quantum States in a Parallel-Coupled Double-Quantum-Dot
• Quantum Computing with an 'Always On' Heisenberg Interaction
• Optical Read-Out and Initialization of an Electron Spin in a Single Quantum Dot
• Efficient Refocussing of One Spin and Two Spin Interactions for NMR Quantum Computation
• Characterization of non-local gates
• Quantum Computing with Globally Controlled Exchange-type Interactions
• Quantum computation with un-tunable couplings
• Quantum Computing in Arrays Coupled by 'Always On' Interactions
• Selective spin coupling through a single exciton
• Multi-Qubit Gates in Arrays Coupled by 'Always On' Interactions

Cited by in corpus (12)

• Bang-bang control of fullerene qubits using ultra-fast phase gates
• Towards a fullerene-based quantum computer
• Local Unitary Quantum Cellular Automata
• Geometric Effects and Computation in Spin Networks
• What is a quantum computer, and how do we build one?
• Nonlocal fluctuations and control of dimer entanglement dynamics
• Creating nuclear spin entanglement using an optical degree of freedom
• Global Optical Control of a Quantum Spin Chain
• Correlations in emitters coupled to plasmonic waveguides
• Programmable Quantum Networks with Pure States
• Optimized pulse sequences for suppressing unwanted transitions in quantum systems
• Molecular architectures based on pi-conjugated block copolymers for global quantum computation