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1 vote
1 answer
82 views

Current situation of quantum computing with respect to physical vs logical qubits

As an example I'm going to start with Google and IBM. Google has the Sycamore processor right now with 53 physical qubits. However I haven't found any info on how many logical qubits it can actually ...
Omeglac's user avatar
  • 155
1 vote
2 answers
484 views

Sycamore 2 versus Osprey

Google recently hit key milestone by reducing errors: https://www.nature.com/articles/d41586-023-00536-w I would like to know why Google's QPU had way fewer qubits than IBM's Osprey and if IBM also ...
Duen's user avatar
  • 436
1 vote
0 answers
400 views

Does a quantum computer exist today? [closed]

I agree that this may not be an easy question to answer. But lately, I increasingly come across the fact that many news materials and research papers in the field of quantum technologies say that at ...
alexhak's user avatar
  • 471
2 votes
2 answers
222 views

Is there a quantum processor with physically implemented Toffoli gate?

Recently, I came across the article Realization of efficient quantum gates with a superconducting qubit-qutrit circuit where its authors proposed a physical implementation of three qubits quantum ...
Martin Vesely's user avatar
7 votes
3 answers
3k views

How are the IBM's and Google's Hadamard gates fabricated and operated?

There are thousands of articles, books and web sites describing the Hadamard Gate from a theoretical point of view. But I haven't been able to find any photo about any real implementeation of a ...
skan's user avatar
  • 173
1 vote
1 answer
124 views

Simulating noise of googles quantum computers

Is there a way to simulate the noise of googles quantum computers using circ? In the same way that any of IBM's computers can be simulated using different backends? ...
LOC's user avatar
  • 373
7 votes
1 answer
430 views

Why does Google's quantum processor outperform IBM's?

I understand that both have 53 qubit devices, yet it is Google that has demonstrated quantum supremacy (although IBM refutes this!). I'm not sure if this is true but it seems like IBM cannot replicate ...
user1936752's user avatar
  • 3,085
13 votes
3 answers
740 views

Why do the IBM and Google processors both have 53 qubits?

As I understand from this IBM post both the IBM and Google teams have independently built 53-qubit processors. What is the significance of the number 53? It is purely coincidental, or is there a ...
Randomblue's user avatar