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Google’s new quantum computer solved a calculation in five minutes that would take longer than the universe’s existence to solve with a regular supercomputer. The time it would take the supercomputer to do the calculation is nearly a million billion times longer than the age of the universe.

Their work pushes semiconductor-superconductor hybrid technology to new heights and strengthens Purdue’s role in quantum research.

Microsoft Advances Topological Quantum Computing

Microsoft Quantum recently published an article in Nature, highlighting key advancements in measuring quantum devices — an essential step toward building a topological quantum computer. The research was conducted by Microsoft scientists and engineers, including those at Microsoft Quantum Lab West Lafayette, based at Purdue University. In their announcement, the team described the operation of a crucial device that serves as a foundational building block for topological quantum computing. Their findings mark a significant milestone in the development of quantum computers, which have the potential to be far more powerful and resilient than current technologies.

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 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.
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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 SupĂ©rieure in France and his colleagues have adapted the technique to observe collections of atoms allowed to move in free space, unconstrained by traps.

Long Ju, the lead researcher, describes the new material, rhombohedral pentalayer graphene, as a gold mine, with discoveries revealed at every step.

A novel class of quantum particles behaves in unexpected ways

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.