Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2002-12-16
Phys. Rev. A 67, 042319 (2003)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
15 pages, 16 figures, 1 table, submitted to Phys. Rev. A
Scientific paper
10.1103/PhysRevA.67.042319
Solid state quantum bits are promising candidates for the realization of a {\em scalable} quantum computer. However, they are usually strongly limited by decoherence due to the many extra degrees of freedom of a solid state system. We investigate a system of two solid state qubits that are coupled via $\sigma_z^{(i)} \otimes \sigma_z^{(j)}$ type of coupling. This kind of setup is typical for {\em pseudospin} solid-state quantum bits such as charge or flux systems. We evaluate decoherence properties and gate quality factors in the presence of a common and two uncorrelated baths coupling to $\sigma_z$, respectively. We show that at low temperatures, uncorrelated baths do degrade the gate quality more severely. In particular, we show that in the case of a common bath, optimum gate performance of a CPHASE gate can be reached at very low temperatures, because our type of coupling commutes with the coupling to the decoherence, which makes this type of coupling attractive as compared to previously studied proposals with $\sigma_y^{(i)} \otimes \sigma_y^{(j)}$ -coupling. Although less pronounced, this advantage also applies to the CNOT gate.
Storcz Markus J.
Wilhelm Frank K.
No associations
LandOfFree
Decoherence and gate performance of coupled solid state qubits does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Decoherence and gate performance of coupled solid state qubits, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Decoherence and gate performance of coupled solid state qubits will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-426426