Abstract
Recently, it has been suggested that it may be possible to use combinations of coupled quantum wire waveguides to form quantum computational qubits [1],[2]. However, there are several related problems intrinsic to this approach. First, in order to completely switch the electron probability wave from one waveguide to another, the length of the region in which the two waveguides are coupled must be tuned quite precisely. In addition, even with a well-tuned coupling length, it appears that complete transmission of the probability wave cannot be achieved [2]. Both of these problems may be mitigated by the addition of a bias along the length of the quantum wires - this would effectively alter the coupling length and may also increase the transmission gain. We show that adding this bias does not provide gain to overcome the lack of 100% coupling, between the two guides, but can be used to compensate for imprecision in the length of the device's coupling region.
| Original language | English (US) |
|---|---|
| Title of host publication | 2002 International Conference on Computational Nanoscience and Nanotechnology - ICCN 2002 |
| Editors | M. Laudon, B. Romanowicz |
| Pages | 231-234 |
| Number of pages | 4 |
| State | Published - 2002 |
| Event | 2002 International Conference on Computational Nanoscience and Nanotechnology - ICCN 2002 - San Juan, Puerto Rico Duration: Apr 21 2002 → Apr 25 2002 |
Other
| Other | 2002 International Conference on Computational Nanoscience and Nanotechnology - ICCN 2002 |
|---|---|
| Country | Puerto Rico |
| City | San Juan |
| Period | 4/21/02 → 4/25/02 |
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Keywords
- Coupled quantum wires
- Mode-matching
- Quantum waveguide
- Qubit
ASJC Scopus subject areas
- Engineering(all)
Cite this
Gain in a semiconductor waveguide qubit. / Harris, J.; Ferry, D. K.; Akis, R.
2002 International Conference on Computational Nanoscience and Nanotechnology - ICCN 2002. ed. / M. Laudon; B. Romanowicz. 2002. p. 231-234.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Gain in a semiconductor waveguide qubit
AU - Harris, J.
AU - Ferry, D. K.
AU - Akis, R.
PY - 2002
Y1 - 2002
N2 - Recently, it has been suggested that it may be possible to use combinations of coupled quantum wire waveguides to form quantum computational qubits [1],[2]. However, there are several related problems intrinsic to this approach. First, in order to completely switch the electron probability wave from one waveguide to another, the length of the region in which the two waveguides are coupled must be tuned quite precisely. In addition, even with a well-tuned coupling length, it appears that complete transmission of the probability wave cannot be achieved [2]. Both of these problems may be mitigated by the addition of a bias along the length of the quantum wires - this would effectively alter the coupling length and may also increase the transmission gain. We show that adding this bias does not provide gain to overcome the lack of 100% coupling, between the two guides, but can be used to compensate for imprecision in the length of the device's coupling region.
AB - Recently, it has been suggested that it may be possible to use combinations of coupled quantum wire waveguides to form quantum computational qubits [1],[2]. However, there are several related problems intrinsic to this approach. First, in order to completely switch the electron probability wave from one waveguide to another, the length of the region in which the two waveguides are coupled must be tuned quite precisely. In addition, even with a well-tuned coupling length, it appears that complete transmission of the probability wave cannot be achieved [2]. Both of these problems may be mitigated by the addition of a bias along the length of the quantum wires - this would effectively alter the coupling length and may also increase the transmission gain. We show that adding this bias does not provide gain to overcome the lack of 100% coupling, between the two guides, but can be used to compensate for imprecision in the length of the device's coupling region.
KW - Coupled quantum wires
KW - Mode-matching
KW - Quantum waveguide
KW - Qubit
UR - http://www.scopus.com/inward/record.url?scp=6344221925&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=6344221925&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:6344221925
SN - 0970827563
SN - 9780970827562
SP - 231
EP - 234
BT - 2002 International Conference on Computational Nanoscience and Nanotechnology - ICCN 2002
A2 - Laudon, M.
A2 - Romanowicz, B.
ER -