dorsal/arxiv
View SchemaQuantum Computing with Spin Qubits Interacting Through Delocalized Excitons: Overcoming Hole Mixing
| Authors | Brendon W. Lovett, Ahsan Nazir, Ehoud Pazy, Sean D. Barrett, Tim P. Spiller, G. Andrew D. Briggs |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0505055 |
| URL | https://arxiv.org/abs/quant-ph/0505055 |
| DOI | 10.1103/PhysRevB.72.115324 |
| Journal | Phys. Rev. B 72, 115324 (2005) |
Abstract
As a candidate scheme for controllably coupled qubits, we consider two quantum dots, each doped with a single electron. The spin of the electron defines our qubit basis and trion states can be created by using polarized light; we show that the form of the excited trion depends on the state of the qubit. By using the Luttinger-Kohn Hamiltonian we calculate the form of these trion states in the presence of light-heavy hole mixing, and show that they can interact through both the F\"orster transfer and static dipole-dipole interactions. Finally, we demonstrate that by using chirped laser pulses, it is possible to perform a two-qubit gate in this system by adiabatically following the eigenstates as a function of laser detuning. These gates are robust in that they operate with any realistic degree of hole mixing, and for either type of trion-trion coupling.
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"abstract": "As a candidate scheme for controllably coupled qubits, we consider two\nquantum dots, each doped with a single electron. The spin of the electron\ndefines our qubit basis and trion states can be created by using polarized\nlight; we show that the form of the excited trion depends on the state of the\nqubit. By using the Luttinger-Kohn Hamiltonian we calculate the form of these\ntrion states in the presence of light-heavy hole mixing, and show that they can\ninteract through both the F\\\"orster transfer and static dipole-dipole\ninteractions. Finally, we demonstrate that by using chirped laser pulses, it is\npossible to perform a two-qubit gate in this system by adiabatically following\nthe eigenstates as a function of laser detuning. These gates are robust in that\nthey operate with any realistic degree of hole mixing, and for either type of\ntrion-trion coupling.",
"arxiv_id": "quant-ph/0505055",
"authors": [
"Brendon W. Lovett",
"Ahsan Nazir",
"Ehoud Pazy",
"Sean D. Barrett",
"Tim P. Spiller",
"G. Andrew D. Briggs"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevB.72.115324",
"journal_ref": "Phys. Rev. B 72, 115324 (2005)",
"title": "Quantum Computing with Spin Qubits Interacting Through Delocalized Excitons: Overcoming Hole Mixing",
"url": "https://arxiv.org/abs/quant-ph/0505055"
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