Molecular Quantum Entanglement in Functionalized Semiconductor Nanostructures
نویسندگان
چکیده
(Dated: March 12, 2004) The feasibility of creating molecular quantum entanglement in functionalized semiconductor nanostructures is computationally demonstrated. Entangled hole states, localized deep in the semiconductor band gap, are generated by electron-hole pair separation after photoexcitation of molecular surface complexes. The approach is illustrated for model arrays of catechol molecules anchored to small TiO2-anatase nanostructures. It is shown that molecular quantum entanglement can persist for hundreds of picoseconds in spite of thermal motion and surface disorder, under cryogenic and vacuum conditions. Moreover, it is shown that the relaxation dynamics of the entangled states can be coherently controlled by a sequence of ultrashort 2π pulses.
منابع مشابه
Dynamics of electron entanglement in semiconductor nanostructures
Quantum entanglement, the most remarkable feature of quantum physics, is recognized as a resource for quantum information processing. The quest for quantum-computing devices has also produced great interest in entanglement formation in solid-state systems involving quantum effects. Indeed, the functionality of an increasing number of nanodevices is influenced by quantum correlations. In this wo...
متن کاملCoherent optical control of electronic excitations in functionalized semiconductor nanostructures
The feasibility of creating and manipulating coherent quantum states on surfaces of functionalized semiconductor nanostructures is computationally investigated. Quantum dynamics simulations of electron-hole transfer between catechol molecules adsorbed on TiO2 -anatase nanostructures under cryogenic and vacuum conditions indicate that laser induced coherent excitations can be prepared and manipu...
متن کاملPseudospin quantum computation in semiconductor nanostructures.
We theoretically show that spontaneously interlayer-coherent bilayer quantum Hall droplets should allow robust and fault-tolerant pseudospin quantum computation in semiconductor nanostructures with voltage-tuned external gates providing qubit control and a quantum Ising Hamiltonian providing qubit entanglement. Using a spin-boson model, we estimate decoherence to be small (approximately 10(-5)).
متن کاملModel study of coherent quantum dynamics of hole states in functionalized semiconductor nanostructures.
Functionalization of semiconductor nanocrystals can be achieved by anchoring organic ligands to the surface dangling bonds. The resulting surface complexes often introduce electronic states in the semiconductor band gap. These interband states sensitize the host material for photoabsorption at frequencies characteristic of the molecular adsorbates, leading to the well-known process of photoexci...
متن کاملSpin entanglement generation and detection in semiconductor nanostructures
Entanglement, viz. the non-separability of quantum states, is a fundamental prediction of quantum mechanics, which is at odds with the classical perception of reality. Furthermore, it constitutes a resource for quantum computation and quantum communication. Electronic degrees of freedom in nanostructures – in particular the spin – constitute promising candidates to implement quantum information...
متن کامل