What is the most scalable qubit candidate for quantum computing?

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Discussion Overview

The discussion centers on identifying the most scalable qubit candidates for quantum computing, exploring various types of qubits and their scalability challenges. It includes theoretical considerations, practical limitations, and comparisons between different qubit technologies.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants propose that solid-state qubits could theoretically be scaled up significantly, allowing for the fabrication of circuits with hundreds of potential qubits, although practical implementation faces challenges.
  • Concerns are raised about decoherence affecting the ability to entangle many qubits, with the current record for conventional solid-state qubits being 4.
  • Participants note that the highest number of entangled qubits achieved is 8, which has been accomplished using ion-trap and NMR setups, but these methods face scalability limitations.
  • One participant explains that the complexity of ion trap setups, which require extensive equipment for each qubit, limits the number of ions that can be effectively trapped and manipulated.

Areas of Agreement / Disagreement

Participants express differing views on the scalability of various qubit types, with no consensus on which qubit candidate is the most scalable or the specific limitations of each approach.

Contextual Notes

The discussion highlights limitations related to decoherence, the complexity of experimental setups, and the practical challenges of scaling ion traps, but does not resolve these issues.

Who May Find This Useful

Researchers and practitioners in quantum computing, as well as those interested in the theoretical and practical aspects of qubit technologies.

rviveksarma
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Whats most scalable qubit candidate so far ?

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Thanks,
Vvk
 
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In principle solid state qubits. There are several types that could -in theory- be scaled up to whatever size you want and it would be easy to fabricate a circuit containing hundreds of "potential" qubits. But the circuit would not work.
The problem is of course that decoherence kicks in and makers it difficult to entangle many qubits, the current record for a conventional solid-state qubit is 4.

The current record when it comes to number of entangled qubits of any type is 8, which has been done with a normal ion-trap (of a type that can't really be scaled up much further) and -if I remember correctly- an NMR setup (which again can't be scaled up much further).
 
Thanks for reply, f95toli. :)

Can you please expand on the upper cap that is restricting Ion Trap... to 8.
 
Mainly the complexity fo the setup, you need an awful lot of equipment for each qubit (lasers to trap the ions etc) and making ions traps for more than a few ions is very difficult. Even a normal single ion trap is a pretty serious piece of experimental equipment.
 

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