Details
| Original language | English |
|---|---|
| Number of pages | 1 |
| Journal | Physical Review A - Atomic, Molecular, and Optical Physics |
| Volume | 66 |
| Issue number | 6 |
| Publication status | Published - 31 Dec 2002 |
| Externally published | Yes |
Abstract
A nonlocal unitary transformation of two-qubits occurs when some Hamiltonian interaction couples them. Here we characterize the amount, as measured by time, of interaction required to perform two-qubit gates, when also arbitrarily fast, local unitary transformations can be applied on each qubit. The minimal required time of interaction, or interaction cost, defines an operational notion of the degree of nonlocality of gates. We characterize a partial order structure based on this notion. We also investigate the interaction cost of several communication tasks, and determine which gates are able to accomplish them. This classifies two-qubit gates into four categories, differing in their capability to transmit classical, as well as quantum, bits of information. 5555 2002 The American Physical Society.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 66, No. 6, 31.12.2002.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Characterization of nonlocal gates
AU - Hammerer, Klemens
AU - Vidal, G.
AU - Cirac, J. I.
PY - 2002/12/31
Y1 - 2002/12/31
N2 - A nonlocal unitary transformation of two-qubits occurs when some Hamiltonian interaction couples them. Here we characterize the amount, as measured by time, of interaction required to perform two-qubit gates, when also arbitrarily fast, local unitary transformations can be applied on each qubit. The minimal required time of interaction, or interaction cost, defines an operational notion of the degree of nonlocality of gates. We characterize a partial order structure based on this notion. We also investigate the interaction cost of several communication tasks, and determine which gates are able to accomplish them. This classifies two-qubit gates into four categories, differing in their capability to transmit classical, as well as quantum, bits of information. 5555 2002 The American Physical Society.
AB - A nonlocal unitary transformation of two-qubits occurs when some Hamiltonian interaction couples them. Here we characterize the amount, as measured by time, of interaction required to perform two-qubit gates, when also arbitrarily fast, local unitary transformations can be applied on each qubit. The minimal required time of interaction, or interaction cost, defines an operational notion of the degree of nonlocality of gates. We characterize a partial order structure based on this notion. We also investigate the interaction cost of several communication tasks, and determine which gates are able to accomplish them. This classifies two-qubit gates into four categories, differing in their capability to transmit classical, as well as quantum, bits of information. 5555 2002 The American Physical Society.
UR - http://www.scopus.com/inward/record.url?scp=85037200403&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.66.062321
DO - 10.1103/PhysRevA.66.062321
M3 - Article
AN - SCOPUS:85037200403
VL - 66
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
SN - 1050-2947
IS - 6
ER -