Here is a nice preprint comparing some of the methods of realizing qubits, including neutral atoms, ions, superconducting circuits, etc.

Natural and artificial atoms for quantum computation

I’m about to give a short talk on this very topic to an undergraduate Computer Science class. The talk will serve two purposes, it will be an introduction to the myriad of different methods by which qubits and quantum computers can actually be realised, and secondly it will be a nice insight into some of the things that experimentalists have to worry about when they are actually building quantum computers. Here is the talk overview:

**Models of quantum computation**

**Implementations**

Ion traps – Optical photons / Neutral atoms – NMR – Superconducting circuits – Nanomechanical resonators

**Example of operation**

The Bloch sphere – The density matrix

**Decoherence + limitations**

The DiVincenzo criteria – Measuring T1 and T2 – Sources of decoherence

Here are the slides:

Unfortunately I won’t be recording this one so no videos this time. Boo.

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Interesting, very interesting…

thanks for posting this ^_^

Great slides. I enjoyed them greatly.

tat was a very good presentation with some practicality in it and which we are deprived of in our course…thanks a lot.

Thanks, glad you enjoyed it 🙂

Also low-spin Molecular Nanomagnets (Cr7Ni) are potential candidates as Qbits. Their technological strong points are:

– Easy synthesis of identical qubits.

– Easy functionalization both for grafting on surfaces and for building multi-qubits gates.

– Easy tailoring of quantum properties and entanglement.

What do you think about?

I don’t see how this system could be implemented with full addressing and readout on each qubit, and how a large number of them could be joined together without some kind of inter-qubit flux-transformer (assuming here that flux/spin is the quantum variable?)

I’d need to see the full scheme. I’d be interested in having a look if you have any links.

They would indeed make nice identical qubits if there was some way to scale the manipulation and readout systems.

There are some proposed implementation schemes called “global manipulation schemes” for which no single spin addressing is required!

Here some links:

http://prl.aps.org/abstract/PRL/v94/i19/e190501

http://prb.aps.org/abstract/PRB/v68/i13/e134417

http://prl.aps.org/abstract/PRL/v88/i1/e017904

At the moment we are working on tailoring the entanglement between these potential qubits:

http://prl.aps.org/abstract/PRL/v104/i3/e037203

Enjoy!