Quantum computers, which operate leveraging quantum mechanics effects, could soon outperform traditional computers in some advanced optimization and simulation tasks. Most quantum computing systems developed so far store and process information using qubits (quantum units of information that can exist in a superposition of two states).
In recent years, however, some physicists and engineers have been trying to develop quantum computers based on qudits, multi-level units of quantum information that can hold more than two states.
Qudit-based quantum systems could store more information and perform computations more efficiently than qubit-based systems, yet they are also more prone to decoherence.
A recent study has realized multipartite entanglement on an optical chip for the first time, constituting a significant advance for scalable quantum information. The paper, titled “Continuous-variable multipartite entanglement in an integrated microcomb,” is published in Nature.
Led by Professor Wang Jianwei and Professor Gong Qihuang from the School of Physics at Peking University, in collaboration with Professor Su Xiaolong’s research team from Shanxi University, the research has implications for quantum computation, networking and metrology.
Continuous-variable integrated quantum photonic chips have been confined to the encoding of and entanglement between two qumodes, a bottleneck withholding the generation or verification of multimode entanglement on chips. Additionally, past research on cluster states failed to go beyond discrete viable, leaving a gap in the generation and detection of continuous-variable entanglement on photonic chips.
Combining on-chip photon-pair sources, two sets of linear integrated circuits for path entanglements and two path-to-orbital angular momentum converters, free-space-entangled orbital angular momentum photon pairs can be generated in high-dimensional vortex states, offering a high level of programmable dynamical reconfigurability.
The company uses so-called “photonic” quantum computing, which has long been dismissed as impractical.
The approach, which encodes data in individual particles of light, offers some compelling advantages — low noise, high-speed operation, and natural compatibility with existing fibre-optic networks. However, it was held back by extreme hardware demands to manage the fact photons fly with blinding speed, get lost, and are hard to create and detect.
PsiQuantum now claims to have addressed many of these difficulties. Yesterday, in a new peer-reviewed paper published in Nature, the company unveiled hardware for photonic quantum computing they say can be manufactured in large quantities and solves the problem of scaling up the system.
The **article** presents the intriguing hypothesis of a two-sided universe with matter and antimatter moving in opposite time directions from the Big Bang. It **explores** the concept of time reversal through the lens of quantum mechanics, using examples like electron-positron annihilation and the theoretical potential of black holes for backward time movement. **Symmetry**, especially CPT symmetry, is highlighted as a cornerstone of physics, suggesting a mirror universe moving backward in time might exist without violating physical laws. **Ideas** such as the “one electron universe” are presented, considering electrons as a single particle moving back and forth through time. However, the article **acknowledges** the importance of broken symmetry, particularly the matter-antimatter imbalance, for the universe’s existence. – Ads/sponsorships/reviews: contact me at. [email protected]. – 👉👉👉 For Bitcoin donations, use the on-chain address below or the Lightning Network address provided below : On-chain Bitcoin donations : bc1qhss4ae60vn2s0a0khtmf4y90qfeju6tzq43thy. Lightning Network LNURL Bitcoin for donations : [email protected]. – Referral link — passive income : 👉https://pawns.app/?r=QuickLearn. – Referral link — Mine Bitcoin Easily : 👉https://gomining.com/?ref=7Xo5l. 👉Discount Coupon: CORNER
A new imaging technique can show the wave-like behavior of unconfined quantum particles.
A research team has shown that a method for imaging atoms held in a 2D array of optical traps can be used to reveal the wave-like behavior of the atoms when they are released into free space [1]. The team placed atoms in the traps, turned the traps off for a short time, and then turned them back on again. By making many measurements of the atoms’ locations after the traps were reactivated, the researchers could deduce the atoms’ wave-like behavior. The team plans to use this technique to simulate interacting systems of particles in quantum states that are not well understood.
Systems composed of many quantum particles, such as certain types of electronic or magnetic states of matter, can be investigated by simulating them using atoms distributed within arrays of optical traps, like eggs in a vast egg carton. One method for studying such atom arrays, called quantum gas microscopy, involves probing the positions and the quantum states of the atoms by using laser beams to make them fluoresce [2]. Joris Verstraten at the École Normale Supérieure in France and his colleagues have adapted the technique to observe collections of atoms allowed to move in free space, unconstrained by traps.
Rhombohedral pentalayer graphene is a unique form of pencil lead. Pencil lead, or graphite, consists of graphene, a single layer of carbon atoms arranged in a hexagonal pattern. Rhombohedral pentalayer graphene has five layers of graphene stacked in a specific order.
In a new study published in Physical Review Letters, scientists have discovered a novel approach to detecting the quantum properties of a system by simply using heat as a witness, requiring no direct measurement of the quantum system itself.
The study proposes connecting thermodynamics with quantum information theory, drawing inspiration from the concept of Maxwell’s demon.
The concept proposed in the 19th century involves an imaginary entity, Maxwell’s demon, that can sort gas molecules by their velocities inside a closed box, seemingly violating the second law of thermodynamics.
Microsoft have announced a quantum breakthrough – the Majorana 1 chip. But what is it and what does it really mean for the future of quantum computing?
Nature paper. https://www.nature.com/articles/s4158… announcement: https://news.microsoft.com/source/fea… Check out @domainofscience ‘s awesome video: • Microsoft’s Topological Quantum Compu… 0:00 Microsoft Announces World’s First Topological Qubit 1:19 The Problem with Normal Quantum Computers 6:47 How Do You Build a Quantum Computer? 14:54 What Do You Actually Do with a Quantum Computer? 18:33 Addressing the Majorana 1 Concerns 🚀 🚀 I help scientists and investors tackle the World’s biggest challenges: EMPIRICAL VENTURES: https://empiricalventures.vc 🤘👨🔬 ROCKSTAR SCIENTIST Merch: https://www.rockstarscientist.org/ 📸 INSTAGRAM / drbenmiles 🚀 JOIN US for members-only content: / drbenmiles A few people have asked so I’ve added the info below. Some of these are affiliate links. If you make a purchase it doesn’t cost you anything extra, but a percentage of the sale will help support this channel and my work to bringing entrepreneurship into science. Camera : Sony A7III https://amzn.to/3OWrmGd Lens: Sigma 402,965 16 mm F1.4 https://amzn.to/49BNJdq Mics: Shure SM7B • Scientists Just Created World’s First… Zoom H4n Pro https://amzn.to/3OXsklB Sennheiser AVX https://amzn.to/4geWnBi.
Check out @domainofscience‘s awesome video: • Microsoft’s Topological Quantum Compu…
0:00 Microsoft Announces World’s First Topological Qubit. 1:19 The Problem with Normal Quantum Computers. 6:47 How Do You Build a Quantum Computer? 14:54 What Do You Actually Do with a Quantum Computer? 18:33 Addressing the Majorana 1 Concerns.
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Concept (the Dyson Scenario), proposed by Freeman Dyson in 1979, proposes a means by which an immortal society of intelligent beings in an open universe may escape the prospect of the heat death of the universe by extending subjective time to infinity even though expending only a finite amount of energy.
Bremermann’s limit can be invoked to deduce that the amount of time to perform a computation on 1 bit is inversely proportional to the change in energy in the system. As a result, the amount of computations that can be performed grows over time. The increase in energy available slows logarithmically, but never stops. Therefore, for any specific computation rate that requires a specific amount of energy, there will come a time when that energy is available to be used.
The intelligent beings would begin by storing a finite amount of energy. They then use half (or any fraction) of this energy to power their thought. When the energy gradient created by unleashing this fraction of the stored fuel was exhausted, the beings would enter a state of zero-energy-consumption until the universe cooled. Once the universe had cooled sufficiently, half of the remaining half (one quarter of the original energy) of the intelligent beings’ fuel reserves would once again be released, powering a brief period of thought once more. This would continue, with smaller and smaller amounts of energy being released. As the universe cooled, the thoughts would be slower and slower, but there would still be an infinite number of them. In 1998 it was discovered that the expansion of the universe appears to be accelerating rather than decelerating due to a positive cosmological constant, implying that any two regions of the universe will eventually become permanently separated from one another. Dyson noted that \.
