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Owned by Utkarsh

Quantum Computing

11 members • Free

A practical community to understand quantum computing and its connection to machine learning — without hype, heavy math, or unrealistic promises.

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8 contributions to Quantum Computing
⚖️ Why Comparing Quantum vs Classical Is Harder Than It Looks
A common question I get is: “So… is quantum better than classical?” The honest answer is: it’s very hard to compare them fairly. Here’s why. 1️⃣ Problem formulation matters: - Small changes in how a problem is written can drastically change performance — for both quantum and classical methods. - If the formulation favours one side, the comparison isn’t meaningful. 2️⃣ Classical baselines improve constantly: - Classical algorithms and hardware are extremely mature. GPUs, distributed systems, optimization tricks — they’re evolving fast. - A “quantum win” today might disappear once classical baselines are improved. 3️⃣ Overheads are real: Running something on quantum hardware includes: - state preparation - measurement - repetition for statistics - classical optimization loops These overheads matter in practical settings. 4️⃣ Noise and scale: Current quantum devices are noisy and limited in size. That means: - Results can be unstable - Scaling behaviour is not fully understood - Simulators can sometimes outperform real devices This is why serious researchers are cautious when claiming performance advantages. It’s not that quantum has no potential —it’s that fair comparison is a very technical and careful process. In business contexts, this is even more important. You don’t want to compare a well-optimized classical pipeline with a prototype quantum experiment. That’s not apples-to-apples. In this community, we’ll always ask: “Is this comparison fair?” Because that question alone filters out a lot of noise. Question: If you had to compare two technologies fairly, what do you think is the most important factor — speed, accuracy, cost, or scalability?
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🎯 What “Quantum Advantage” Actually Means (and Why It’s Rare)
The term quantum advantage is used a lot — and often incorrectly. In its strict sense, quantum advantage means: a quantum approach solves a well-defined task better than the best known classical approach, under fair comparison. That’s a very high bar. A few important clarifications: - Quantum advantage is task-specific, not general - It does not mean “quantum is faster at everything” - It does not mean replacing classical ML pipelines - It often depends on how the problem is formulated In many cases, what looks like “advantage” disappears once: - classical baselines are improved - hybrid methods are compared fairly - overheads are accounted for This is why most serious researchers and practitioners are cautious with the term. Today, much of the real value of quantum work is in: - understanding new representations of problems - exploring alternative modeling assumptions - identifying where advantage might eventually appear Not in claiming performance wins prematurely. In business and applied settings, this distinction matters a lot — because investing based on vague notions of “quantum advantage” is risky. In this community, we’ll always be careful with this language, and we’ll separate: - theoretical possibility - experimental demonstrations - and practical usefulness They are not the same thing. Question: When you hear “quantum advantage,” what do you usually think it means?
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🔗 Why Quantum (Today) Is Always Part of a Hybrid System
One thing I want to be very clear about — and this is based on how things are actually done today — is this: Quantum computers do not work in isolation. Every serious quantum workflow today is: - driven by classical computation - controlled by classical optimization or ML - evaluated with classical metrics The quantum part, when used, is a small component inside a much larger classical pipeline. For example: - Data preprocessing is classical - Model selection is classical - Training loops are classical - Decision-making is classical The quantum system, if used at all, acts as: - a feature generator - a sampler - a structured model component - or an experimental subroutine This is why framing quantum as a “replacement” for classical computing is misleading. A more accurate way to think about it is: Quantum is a new modeling ingredient — not a standalone solution. This hybrid view is not a compromise. It’s simply how current hardware, algorithms, and theory actually work. In this community, we’ll always discuss quantum in this hybrid, realistic context, because that’s the only way it connects to real ML systems and real business workflows. Question: When you think about quantum, do you imagine it replacing something — or augmenting something that already exists?
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🧪 How I Usually Evaluate Whether Quantum Is Worth Considering
When someone asks me about using quantum computing, I don’t start with qubits, circuits, or hardware. I usually start with a few very simple questions. 1. What is the actual problem? Not the tech description — the real business or research goal. 2. What is currently not working well?Is it accuracy, cost, time, scalability, or something else? 3. What classical or ML methods have already been tried?Often there are simpler improvements still available. 4. Where is the bottleneck?Data, modeling assumptions, optimization, or computation? 5. What would success look like?Even a small improvement can be valuable — but it has to be clearly defined. Only after this do we even mention quantum. In many cases, the honest answer is: quantum is not needed here — at least not right now. And that’s a good outcome. This way of thinking avoids hype-driven decisions and helps teams invest their time and money wisely. In this community, I’ll keep sharing how I think about these trade-offs — because good judgment matters more than fancy technology. Question: If you’re exploring quantum, which part feels most unclear right now — the problem, the tools, or the expectations?
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🧩 The Right Question Is Not “How Do I Use Quantum?”
When people first get interested in quantum computing, the question I hear most often is: “How can I use a quantum computer?” That’s almost always the wrong place to start. In practice, the better questions are: - What problem are we actually trying to solve? - Why do current classical or ML approaches struggle? - Is the bottleneck data, computation, or modeling? - What would “better” even mean in this context? Only after these are clear does it make sense to ask whether quantum plays any role at all. This is why most successful work today doesn’t begin with hardware or algorithms. It begins with problem formulation. In many cases, the conclusion is: “Quantum is not needed here.” And that’s a good outcome — it saves time, money, and effort. In this community, we’ll approach quantum from this angle: clear thinking first, technology second. If you’re exploring quantum for a real problem, this mindset matters far more than knowing how qubits work. Question for you: What kind of problem are you currently thinking about — research, business, optimization, ML, or something else?
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1-8 of 8
Utkarsh Singh
1
4points to level up
@utkarsh-singh-7398
I help businesses understand where quantum actually fits, and where it doesn’t. 💬 Open to 1:1 conversations about practical quantum use cases.

Active 21h ago
Joined Jan 21, 2026
Ottawa