Register to reply

Decoherence time scale

by gioialorusso
Tags: decoherence times, photons, qubit, spin
Share this thread:
gioialorusso
#1
Apr23-12, 06:29 AM
P: 9
Hi everybody,
I've searched all the internet but I can't find the answer to my question. Which are times of decoherence for different physical realization of a qubit? Like, if I use photons, or spin electron, or nuclei, or ion trap, to encode a qubit, which are times of decoherence for each?
Thank you for now,
Gioia
Phys.Org News Partner Physics news on Phys.org
Engineers develop new sensor to detect tiny individual nanoparticles
Tiny particles have big potential in debate over nuclear proliferation
Ray tracing and beyond
f95toli
#2
Apr23-12, 06:54 AM
Sci Advisor
PF Gold
f95toli's Avatar
P: 2,253
It can be everything from the order of 1 fs to 1 s.
The time does not only depend on the system used, but also how it is implemented and probed so it is difficult to give any generic answers.
gioialorusso
#3
Apr24-12, 03:56 AM
P: 9
yeah, i know it, but i have really to give some numbers for each particle, and I don't know where to find them... Hope someone has some estimation about the question. thanks for now.

f95toli
#4
Apr24-12, 04:37 AM
Sci Advisor
PF Gold
f95toli's Avatar
P: 2,253
Decoherence time scale

You just have to look up the relevant papers. Things move fast in this field, so what was "state of the art" a few years ago is already dated (i.e. don't bother looking in books).

Just to give you an example: superconducting qubits (which is what I am most familiar with) have gone from having a coherence time of about 10 ns to at least 10 us in just over ten years, and there has been almost one order of magnitude improvement just in the past few years due to improved sample design.
gioialorusso
#5
Apr24-12, 04:44 AM
P: 9
I'll try to search better about optical quantum computation and ion traps. :)


Register to reply

Related Discussions
Time scale of the atom Atomic, Solid State, Comp. Physics 13
Time on the Quantum Scale Quantum Physics 0
Time Scale problem Astronomy & Astrophysics 1
Decoherence time Quantum Physics 1
Time and scale Beyond the Standard Model 0