HeyJaredQuantum Computing Stack Exchange
Quantum Computing Stack Exchange is a specialized, community‑driven Q&A outlet dedicated to the theory, practice, and implementation of quantum computing.
- Indexed articles, last 90 days
- 38
- Latest publication
- Sep 29, 2026
- Audience
- Top 5M sites
- Earliest in this view
- Jul 3, 2026
Latest articles
Modeling CHSH Degradation (S = 2.404) on Rigetti Cepheus-1-108Q: Environmental Thermal Noise vs. Pure Quantum Decoherence (opens the original)
Read excerpt
I am analyzing experimental CHSH benchmark data obtained directly from runs on Rigetti Cepheus-1-108Q hardware via Open Quantum. The run yielded an empirical value of $S = 2.404$ (with single correlations $E_1 = +0.556$, $E_2 = -0.672$, $E_3 = +0.592$, $E_4 = +0.584$), clearly violating the classical bound ($S \le 2.0$) but falling short of the maximum Tsirelson bound ($2\sqr
Is entanglement a property of a state rather than of the spaces, and how should "irreducible to its parts" be stated precisely? (opens the original)
Read excerpt
I'm not a mathematician and I'm trying to make sure I understand this correctly. My understanding is: (1) Hilbert spaces with ⊗ form a symmetric monoidal category, and the product is non-cartesian; (2) entanglement is a property of a state in H_A ⊗ H_B, namely one not in the image of the map from pairs of states; (3) decoherence disperses correlations into the environment, so the pair alone looks mixed while the joint state stays pure. Is this right? And is there a standard way to say a construc
Question about the non-cloning theorem (opens the original)
Read excerpt
The standard proof to the non-cloning theorem shows that no sequence of unitary quantum gates/base states measurements could be used to duplicate the state of some unknown qubit while preserving its state. But may it be possible to clone a qubit with some physical mechanism other than quantum gates or measurement? The proof ignores the possibility of other physical ways to extract information from the quantum system. So may it be possible to clone the full quantum state of a qubit by other means
Has there been a recent breakthrough in experimental quantum computing that makes commercial applications possible within 10 years? (opens the original)
Read excerpt
I'm struggling to reconcile the current experimental status of quantum error correction with the confidence expressed in recent quantum computing roadmaps. My understanding is that we are still establishing the basic ingredients of scalable logical computation. For example, Google’s Quantum error correction below the surface code threshold demonstrates improving a logical memory by increasing code distance. This is a significant result, but there is a substantial gap between the demonstration an
Model of logical errors in circuit from logical errors of individual operations (opens the original)
Read excerpt
Can I infer logical error rates of circuits from logical error rates of single operations? For this, I want to distinguish between two scenarios of different levels of simplification. Scenario 1: Let's say I have a certain QEC code and decoder. I experimentally implemented the state preparation of the logical 0- and +-states and determined the probability of success p(init,0). I also implemented the state preparation + logical operation for a universal set of logical operations, each with 0-stat
Publishing over time
Last 90 days. Choose a month to open its work.
Recurring subjects
Named in the text we hold. One piece can cover several.
Audience
Top 5M sites
Measured Aug 1, 2026
Website popularity band, not a count of readers or article views.
About this data
Counts cover the work we have indexed. Tone needs enough text and a confident classification. Excerpts and episode notes are not full articles or transcripts.
Identity or attribution wrong? Suggest a correction.