Researchers have developed an innovative technique to search for black hole light echoes. Their novel method, which will make it easier for the mass and the spin of black holes to be measured, represents a […]
Electrons typically travel at high speeds, zipping through matter unbound. In the 1930s, physicist Eugene Wigner predicted that electrons could be coaxed into stillness at low densities and cold temperatures, forming an electron ice that […]
Quantum 8, 1519 (2024). https://doi.org/10.22331/q-2024-11-07-1519 Quantum kernel methods are a proposal for achieving quantum computational advantage in machine learning. They are based on a hybrid classical-quantum computation where a function called the quantum kernel is […]
Quantum 8, 1518 (2024). https://doi.org/10.22331/q-2024-11-07-1518 One of quantum theory’s salient features is its apparent indeterminism, i.e. measurement outcomes are typically probabilistic. We formally define and address whether this uncertainty is unavoidable or whether post-quantum theories […]
Scientists routinely build quantitative models — of, say, the weather or an epidemic — and then use them to make predictions, which they can then test against the real thing. This work can reveal how […]
Insider Brief Dr. David Deutsch, a pioneer in quantum computing and the “many worlds” theory, emphasized in a recent interview that quantum theory is the most fundamental in physics, despite early misinterpretations, and supported the […]
Quantum 8, 1517 (2024). https://doi.org/10.22331/q-2024-11-07-1517 A Dicke state and its decohered state are invariant for permutation. However, when another qubits state to each of them is attached, the whole state is not invariant for permutation, […]
Quantum 8, 1516 (2024). https://doi.org/10.22331/q-2024-11-07-1516 Quantum computers are rapidly becoming more capable, with dramatic increases in both qubit count [1] and quality [2]. Among different hardware approaches, trapped-ion quantum processors are a leading technology for […]
Insider Brief: Nu Quantum is collaborating with CERN’s White Rabbit technology to create highly synchronized, data-center-scale quantum computing networks, marking it as the first quantum industrial partner in the WR Collaboration. They are set to […]
Quantum 8, 1515 (2024). https://doi.org/10.22331/q-2024-11-07-1515 A prepare-and-measure scenario is naturally described by a communication matrix that collects all conditional outcome probabilities of the scenario into a row-stochastic matrix. The set of all possible communication matrices […]
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