Quantum Computing Stack Exchange
Quantum Computing Stack Exchange

Questions tagged [ibm-quantum-devices]

183 questions
13
votes
3 answers

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 deeper reason why both team have the same number of…
Randomblue
  • 233
  • 1
  • 4
12
votes
2 answers

Characteristics of the IBM quantum computer

On the IBM Quantum Composer website, there are characteristics of qubit computers. For example, ibmq_16_melbourne. But there is no description anywhere of what: T1(us), T2(us), Frequency (GHz), Readout assignment error, Prob meas0 prep1, Prob meas1…
alexhak
  • 481
  • 4
  • 11
10
votes
2 answers

What use cases are there for 127 qubit QPUs?

IBM have recently announced their 127 qubit Eagle processor. Other approaches, such as Rydberg arrays, have now 256 qubits, as for example in QuEra's QPU QPU. While these are without a doubt outstanding techical acheivements, I am wondering what is…
Lior
  • 1,270
  • 4
  • 17
9
votes
1 answer

Current limits on Grover search space

I was wondering why till date Grover search has been implemented only till 3 qubits (corresponding to size of database = 8). Refer this paper The reason why I ask is that we have much larger sized quantum computers today. For eg IBM has 50 qubits,…
Maharshi Ray
  • 191
  • 2
9
votes
2 answers

Is there a good reason to use T-count minimization for circuits executed on current IBM open quantum systems (real hardware)?

As far as I understood from a series of papers, minimizing the T-count in Clifford+T circuits is essential for fault-tolerant quantum computing: While techniques such as magic state distillation and injection allow for fault-tolerant…
Psanfi
  • 306
  • 1
  • 9
9
votes
3 answers

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 Hadamard Gate on superconducting circuits nor any…
skan
  • 193
  • 1
  • 5
9
votes
2 answers

How to explain in layman’s terms the significance of the difference of qubits of the D-Wave and IBM QX?

So, @AndrewO mentioned recently that he has had 'encounters' with people wondering why D-Wave has a lot more qubits than IBM. Of course, this comparison is faulty, since the IBM and D-Wave's machine may both exploit quantum effects to a certain…
Discrete lizard
  • 3,154
  • 2
  • 20
  • 42
8
votes
3 answers

What are the differences between the IBM machines?

I'm quite new to this field, and have started sending jobs to IBM's quantum computers. I have access to around 11 locations. I can see that these have different numbers of qubits within them, and then different layouts of them as well. I am trying…
Andrew
  • 333
  • 1
  • 6
7
votes
1 answer

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 the quantum circuits and measurements that…
user1936752
  • 3,311
  • 1
  • 9
  • 24
7
votes
2 answers

What is maximum circuit depth and size IBM Q5 and Q16 could handle?

I'm trying to implement a couple of algorithms on ibmq_16_melbourne, so I need to know if this device is able to handle with depth and size of my current circuit or not. For example, the circuit size is 300 and depth is 99.
C-Roux
  • 928
  • 2
  • 9
  • 20
7
votes
2 answers

Topology graphs of IBM's quantum computers

What is the meaning of the topology graphs of IBM's quantum computers? How should it be interpreted? For example, how should I understand the following graph?
AL_P
  • 141
  • 6
7
votes
1 answer

Would IBM's "compiler" turn my identity circuit into nothing?

If I were to create a circuit with the following gate: $$\tag{1}R_\phi = \begin{bmatrix} 1 & 0 \\ 0 & e^{i \phi} \end{bmatrix},$$ with $\phi$ specified to be equal to 0, then the gate that I am running is just the identity gate, and the circuit is…
user1271772 No more free time
  • 14,286
  • 2
  • 26
  • 76
6
votes
0 answers

Resources on the energy consumption of IBM quantum computers?

I am seeking information regarding the energy consumption of IBM Quantum Computers, specifically inquiring about the energy requirements associated with individual gate operations. Could you also provide any available resources or documentation…
goga suknidze
  • 61
  • 2
6
votes
0 answers

Quantum State Tomography Implementation in IBMQ

I am working to understand quantum state tomography, specifically using the algorithm presented in PRL 108, 070502. This paper is referenced in IBMQ implementations of QST, both in old deprecated Ignis code (my primary reference so far) and in the…
Nathan Miller
  • 61
  • 1
6
votes
0 answers

Optical quantum computers VS Superconducting quantum computers VS Electron-spin quantum computers

One of the main problems of superconducting quantum computers is that it is necessary to maintain a very low temperature (near absolute zero). Such cooling is very expensive and complex. Why, then, are Intel, IBM, and many other corporations…
alexhak
  • 481
  • 4
  • 11
1
2 3
…
12 13