dorsal/arxiv
View SchemaElectrical control of superposed quantum states evolution in quantum dot molecule by pulsed field
| Authors | S. W. Hwang, D. Y. Jeong, M. S. Jun, M. H. Son, L. W. Engel, J. E. Oh, D. Ahn |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0107141 |
| URL | https://arxiv.org/abs/quant-ph/0107141 |
Abstract
Quantum computing (or generally, quantum information processing) is of prime interest for it potentially has a significant impact on present electronics and computations1-5. Essence of quantum computing is a direct usage of the superposition and entanglement of quantum mechanical states that are pronounced in nanoscopic particles such as atoms and molecules6, 7. On the other hand, many proposals regarding the realization of semiconductor quantum dot (QD) qubits8,9 and QD quantum gates10 were reported and several experimental clues were successfully found11-16. While these pioneering experiments opened up the basis of semiconductor QD quantum computing, direct electrical control of superposed states in time domain17 has not been realized yet. Here, we demonstrate the coherent control of the superposed quantum states evolution in the QD molecule. Short electrical pulses are shown to inject single electron into the QD molecule and the current collected at the substrate exhibits oscillations as a function of the pulse width. The oscillations are originated from different decay rates of the symmetric (S) and the anti-symmetric (AS) state of the QD molecule and the evolution of the occupation probabilities controlled by the injection pulse width
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"abstract": "Quantum computing (or generally, quantum information processing) is of prime\ninterest for it potentially has a significant impact on present electronics and\ncomputations1-5. Essence of quantum computing is a direct usage of the\nsuperposition and entanglement of quantum mechanical states that are pronounced\nin nanoscopic particles such as atoms and molecules6, 7. On the other hand,\nmany proposals regarding the realization of semiconductor quantum dot (QD)\nqubits8,9 and QD quantum gates10 were reported and several experimental clues\nwere successfully found11-16. While these pioneering experiments opened up the\nbasis of semiconductor QD quantum computing, direct electrical control of\nsuperposed states in time domain17 has not been realized yet. Here, we\ndemonstrate the coherent control of the superposed quantum states evolution in\nthe QD molecule. Short electrical pulses are shown to inject single electron\ninto the QD molecule and the current collected at the substrate exhibits\noscillations as a function of the pulse width. The oscillations are originated\nfrom different decay rates of the symmetric (S) and the anti-symmetric (AS)\nstate of the QD molecule and the evolution of the occupation probabilities\ncontrolled by the injection pulse width",
"arxiv_id": "quant-ph/0107141",
"authors": [
"S. W. Hwang",
"D. Y. Jeong",
"M. S. Jun",
"M. H. Son",
"L. W. Engel",
"J. E. Oh",
"D. Ahn"
],
"categories": [
"quant-ph"
],
"title": "Electrical control of superposed quantum states evolution in quantum dot molecule by pulsed field",
"url": "https://arxiv.org/abs/quant-ph/0107141"
},
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"variant": "snapshot-2026-03-01",
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