Did a lab claim it sent info back in time? How did scientists react?

"One of the most enticing experiments that seems to support such an interpretation is the Delayed Choice Quantum Eraser designed by Yoon-Ho Kim et al. (2000)."

"This does not arise as a paradox if the quantum state is viewed as just a representative of information."

"researchers at the University of Toronto, through innovative quantum experiments, say they have demonstrated that "negative time" isn't just a theoretical idea – it exists in a tangible, physical sense, deserving closer scrutiny."

"It is set up to measure correlated pairs of photons, which are in an entangled state, so that one of the two photons is detected 8 nanoseconds before its partner."

""We don't want to say anything traveled backward in time," Steinberg said. "That's a misinterpretation.""

"The result is, however, in accordance with the predictions of quantum mechanics."

"Critically, the researchers say, this doesn't violate Einstein's theory of special relativity , which dictates that nothing can travel faster than light. These photons carried no information, sidestepping any cosmic speed limits."

"However, David Ellerman (2015) argues that interpreting delayed-choice experiments or similar experiments as revealing cases of backward causation or retrocausation relies on what he calls the separation fallacy:"

""The negative time in this experiment has nothing to do with the passage of time – it's just a way to describe how photons travel through a medium and how their phases shift.""

"Price’s suggestion has inspired a small community of philosophers and scientists to develop deterministic models in which backward causation generates the correlations of entangled pairs."

"Steinberg acknowledged the controversy surrounding their paper's provocative headline but pointed out that no serious scientist has challenged the experimental results."

"the simulation of atraversable wormhole [9], space-times in which superluminal trips are allowed and even CTCs [10]"

"This is called delayed-choice entanglement swapping."

"However, when attempting to propose an analogue quantum simulation by means of an SQUID array, fundamental restrictions appear, preventing us from simulating negative-time trajectories and thus CTCs."

"Wheeler's delayed-choice experiment was conceived to illustrate the paradoxical nature of wave-particle duality in quantum mechanics."

"The procedure was proposed as a thought experiment by [16], but has now been realized experimentally by [17] and others."

"appears as a technical limitation of the particular analogue setup considered and not as a general feature, as expected in a simulation."

"Thus, Victor’s measurement must not only be capable of influence at a (spacelike) distance, but also backwards in time."

"the apparent action at a distance may be an artifact of ‘collider bias’."

"W.K(cid:32)lobus,A.Grudka,andA.Wo´jcik,Commenton“Informationflowofquantumstatesinteractingwithclosedtimelike"

"Using the newly developed control protocols, researchers can suppress the usual emergence of the arrow of time or even reverse its apparent direction, making quantum processes look as though they are unfolding backward."

"авторитетный английский журнал Nature опубликовали несколько статей разных групп исследователей, пытавшихся выявить изменение веса вращающегося гироскопа , предсказываемое гипотезой Н. Козырева. В одну из групп входил известный американский физик Джеймс Э. Фаллер [англ.] , специализирующийся на проблемах гравитации и анализе попыток пересмотра её законов. Во всех описанных в журналах случаях резул"

"It is the separation fallacy that leads"

"To overcome that effect, the researchers combined measurements with feedback to produce time reversed stochastic trajectories. This allowed quantum systems to follow paths that appear consistent with time flowing in reverse."

"проверка результатов его экспериментов, проведённая по его же просьбе двумя Комиссиями Учёного Совета Пулковской обсерватории в 1960 и 1967 годах, показала, что наблюдаемые им эффекты находятся на пределе точности измерений и не являются убедительными."

"The separation fallacy mistakes the creation of a tagged or entangled superposition for a measurement."

"Thisisthefundamentalmistakeintheprevalent interpretationofthedelayed-choicequantumeraser[6,7]."

"Looking ahead, the researchers plan to experimentally demonstrate Hamiltonian based measurement processes for quantum feedback control using superconducting qubits."

"Попытки некоторых учёных получить новые экспериментальные подтверждения, предпринятые в начале 90-х годов, также не увенчались успехом и по той же причине."

"По мнению академика РАН , директора Государственного астрономического института Анатолия Черепащука , в настоящее время теория Н. Козырева отвергается подавляющим большинством физиков и астрономов ввиду полной необоснованности"

"Scientists have designed quantum control protocols that generate processes more consistent with time flowing backward than forward."

"We must conclude, therefore, that the loss of distinguishability is but a side effect,"

"The backward-time channel they study can be simulated using quantum experiments – a way of modeling time travel without bending spacetime at all."

"(Later physics has shown that the second law is not violated when all sources of thermodynamic costs are accounted for.)"

"Real backward-in-time channels remain beyond the reach of current laboratories."

"Earlier work showed that an idealized backward channel could do remarkable things, but practical noise spoils most of those tricks."