Subject: Basic Sciences

Central Idea

• Microsoft researchers have made significant strides in the creation of Majorana zero modes, a type of particle that could revolutionize quantum computing.
• Majorana zero modes, which are their own antiparticles, possess unique properties that could make quantum computers more robust and computationally superior.

Majorana Fermions: A conceptual backgrounder

• Fermions and Antiparticles: All subatomic particles that constitute matter are known as fermions, with each fermion having an associated antiparticle that annihilates upon interaction.
• Majorana Fermions: In 1937, Italian physicist Ettore Majorana discovered that certain particles, known as Majorana fermions, can satisfy specific conditions and be their own antiparticles.
• Neutrinos as Potential Majorana Fermions: Neutrinos are one type of subatomic particle that scientists speculate may exhibit Majorana fermion behavior, although experimental confirmation is still pending.

Understanding Majorana Zero Modes

• Quantum Numbers and Spin: All particles have four quantum numbers, with one called the quantum spin having half-integer values for fermions. This property allows any fermion, even a large entity like an atom, to be classified as a fermion.
• Bound States and Fermions: Bound states composed of two particles can also be classified as fermions if their total quantum spin possesses a half-integer value.
• Majorana Zero Modes: When these bound states are their own antiparticles and do not readily de-cohere, they are known as Majorana zero modes, which have been sought after by physicists for many years.

Potential Benefits for Computing

• Enhanced Stability: Majorana zero modes offer increased stability for qubits, the fundamental units of information in quantum computing. Even if one entity within the bound state is disturbed, the qubit as a whole can remain protected and retain encoded information.
• Topological Quantum Computing: Majorana zero modes can enable topological quantum computing, which takes advantage of non-Abelian statistics. These statistics introduce an additional degree of freedom, allowing algorithms to produce different outcomes based on the order in which steps are performed.

Challenges and Future Prospects

• Creating Majorana Zero Modes: Scientists have been exploring various setups, such as topological superconductors, to generate Majorana zero modes. However, confirming their existence remains a challenge, as their effects on surrounding materials must be inferred indirectly.
• Recent Advances by Microsoft Researchers: Microsoft researchers recently engineered a topological superconductor using an aluminium superconductor and an indium arsenide semiconductor. Their device passed a stringent protocol, suggesting a high probability of hosting Majorana zero modes.

Future prospects

• While this achievement is significant, the existence of Majorana fermions and their potential for topological quantum computing still need independent confirmation.
• Continued improvements in simulation, growth, fabrication, and measurement capabilities are necessary to achieve the desired topological gap for coherent operations.

Central Idea

• Tomato growers in Maharashtra and Karnataka have reported significant yield losses due to the impact of two different Mosiac Viruses.
• The cucumber mosaic virus (CMV) has affected tomato crops in Maharashtra, while the tomato mosaic virus (ToMV) has been blamed for crop losses in Karnataka and other South Indian states.

Impact on Tomato Crops

• Symptoms of ToMV: Infected plants exhibit alternating yellowish and dark green areas, blisters on leaves, leaf distortion, twisting of younger leaves, necrotic spots on fruits, and reduced fruit setting.
• Symptoms of CMV: Leaf distortion, with top and bottom leaves most affected, mosaic-like patterns of yellow and green spots in cucumber, fruit deformation, and reduced production in tomato.

Control Measures

• ToMV: Ensuring biosafety standards in nurseries, seed treatment, careful inspection of saplings before planting, continuous monitoring for infection, and removal of infected plants are crucial.
• CMV: Due to its wide host range, controlling aphids becomes essential. Measures include spraying quick-acting insecticides or mineral oils, monitoring aphid migration, and clearing fields of weeds and plant material that may harbor the virus.

Central Idea

• India’s Giant Metrewave Radio Telescope (GMRT) is part of an international effort involving six large telescopes.
• The telescopes have provided evidence confirming the presence of gravitational waves through pulsar observations.

Giant Metrewave Radio Telescope (GMRT)

• The GMRT is an array of thirty fully steerable parabolic radio telescopes located near Narayangaon, Pune, in India.
• It is renowned as the world’s largest and most sensitive radio telescope array operating at low frequencies.
• It is operated by the National Centre for Radio Astrophysics (NCRA), a part of the Tata Institute of Fundamental Research, Mumbai.
• It has made significant contributions to the field of astronomy since its construction under the guidance of Late Prof. Govind Swarup between 1984 and 1996.
• The recent upgrade of the GMRT has further enhanced its capabilities, earning it the name “upgraded Giant Metrewave Radio Telescope” (uGMRT).

Location and Specifications

• Location: The GMRT Observatory is situated approximately 80 km north of Pune, near Khodad, with the town of Narayangaon just 9 km away. The NCRA office is located within the Savitribai Phule Pune University campus.
• Telescope Array: The GMRT consists of thirty fully steerable parabolic radio telescopes, each with a diameter of 45 meters.
• Interferometry Array: The telescopes are configured in an interferometric array with baselines of up to 25 kilometres, allowing for precise and detailed observations.

Science and Observations

• Galaxy Formation and 21-cm Line Radiation: The GMRT was designed to search for highly redshifted 21-cm line radiation from primordial neutral hydrogen clouds, enabling the determination of the epoch of galaxy formation in the universe.
• Diverse Astronomical Objectives: Astronomers from around the world utilize the GMRT for studying a wide range of celestial objects, including HII regions, galaxies, pulsars, and supernovae, as well as the Sun and solar winds.

Remarkable Discoveries

• Most Distant Galaxy: In August 2018, the GMRT discovered the most distant known galaxy, located 12 billion light-years away.
• Ophiuchus Supercluster Explosion: In February 2020, the GMRT played a crucial role in observing the largest explosion ever recorded in the universe, the Ophiuchus Supercluster explosion.
• Radio Signal from the Distant Universe: In January 2023, the GMRT detected a radio signal originating from 8.8 billion light-years away, specifically a fast radio burst (FRB) known as FRB 2023L.

Recent Observations

• Time Aberrations: The team observed time aberrations in the signals emitted by pulsars, indicating the possible presence of gravitational waves.
• Galactic-Scale Gravitational Wave Detector: Scientists distributed ultra-stable pulsar clocks across the Milky Way to create a virtual detector sensitive to gravitational wave signals.
• Arrival Time Variations: The arrival times of signals from pulsars were affected by the presence of gravitational waves, causing slight delays or advances.

Significance of the Findings

• Humming Signals: Nano-hertz signals caused by gravitational waves were detected, leading to the identification of their presence in the universe.
• Opening a New Window: The team’s results represent a significant milestone in exploring the gravitational wave spectrum, providing new insights into astrophysics.
• Sensitivity and Timeframe: Detecting these elusive nano-hertz gravitational waves requires sensitive telescopes like GMRT and long-term observations due to their slow variations.

Central Idea

• Two US-based companies have received approval from the US Food and Drug Administration (FDA) to produce and sell cell-cultivated chicken, a type of lab-grown meat.
• This development is seen as a significant step towards reducing carbon emissions associated with the food industry.

Cell-Cultivated Chicken: How is it made?

• Cell Isolation: The companies isolate cells from live animals that are likely to taste good and reproduce consistently.
• Nutrient-Rich Mixture: The isolated cells are combined with a broth-like mixture containing essential nutrients, such as amino acids, fatty acids, sugars, salts, vitamins, and others required for cell growth.
• Cultivation in Bioreactors: The cells are placed in bioreactors or cultivators, creating a controlled environment that supports cell growth.
• Rapid Proliferation: Within two to three weeks, the cells multiply and form either large sheets (Upside Foods) or cell aggregates (Good Meat).
• Processing and Shaping: The cellular materials are collected, processed, and shaped into various meat products such as cutlets, sausages, or other forms.

Forms of Cell-Cultivated Meat

• Focus on Chicken: Good Meat and Upside Foods initially concentrate on cell-cultivated chicken, given its global consumption demand.
• Expansion Plans: These companies aim to extend their offerings to include other meats in the future. Research is underway for cell-cultivated versions of beef, sea bass, tuna, and shrimp.

Motivations behind Cell-Cultivated Meat

• Climate Mitigation: Cell-cultivated meat has the potential to reduce carbon emissions and land use associated with livestock production, addressing climate change concerns.
• Animal Welfare: By eliminating traditional animal farming, it aims to prevent animal cruelty.
• Food Security: Advocates view alternative meat as a means to meet nutritional demands worldwide.

Challenges to Overcome

• Consumer Acceptance: Ensuring that cell-cultivated meat matches the taste, texture, and appearance of traditional meat remains a challenge for widespread adoption.
• Cost Factors: The cost of cell-cultivated meat is expected to remain high in the near future, with concerns regarding quality control at scale.
• Resource Requirements: High-quality cells, suitable growth mediums, and other resources are necessary for successful cultivation.
• Environmental Impact: Studies highlight uncertainties regarding the environmental impact of cell-cultivated meat production, particularly concerning the growth medium used.

Central Idea: All five crew onboard the Titan submersible are dead after a catastrophic implosion.

What is Submersible?

• Submersibles are vessels designed for underwater travel, often used for research, exploration, and tourism purposes.
• They are white tubes of about 6.7 meters long and 2.8 meters wide, and have a top speed of three knots or 5.5 kilometers (3.5 miles) an hour.
• In the context of tourism, submersibles provide passengers with the opportunity to experience the wonders of the underwater world and explore marine ecosystems.
• Submersible tourism has gained popularity among adventurous travellers, offering unique opportunities to explore the underwater world.

Submersible Tourism and the Titanic Site 

• The wreckage of the RMS Titanic, discovered in 1985, has been a popular destination for tourists over the years.
• OceanGate Expeditions began offering Titanic expeditions, taking crews of “citizen scientists” and “crew members” to the site since 2010.

About Titan Submersible 

• The Titan submersible was constructed using titanium and filament-wound carbon fiber.
• With a length of 22 feet and a weight of 10,432 kg, it was capable of reaching depths of 4,000 meters (13,123 feet).

Functionality and Equipment

• The submersible employed 4 electric thrusters for movement and maneuverability.
• Equipped with an array of cameras, lights, and scanners, the Titan facilitated deep-sea exploration and surveying.
• Communication in deep waters was achieved using sound waves (sonar) since radio waves do not transmit effectively.

Differentiating Submersibles and Submarines  

• Submersibles, such as the Titan, are not fully autonomous and require support ships for launch and recovery.
• They descend using weights and do not possess the power to launch independently.
• Submarines, on the other hand, are self-propelled and capable of launching and returning without external support.

Depth and Cost

• The maximum depth for the OceanGate Titanic expedition is around 12,800 feet, with the wreck located at 12,500 feet.
• The cost of touring the Titanic varies, with the OceanGate expedition priced at $250,000 per person.

Safety Considerations in Submersible Tourism 

• The submersible tourism industry adheres to international safety standards and has maintained a safety record without incident for 50 years, according to the Marine Technology Society (MTS).
• Submersible tour companies conduct detailed risk assessments for each experience, ensuring clients are aware of the potential risks involved.
• Clients often undergo risk assessments and sign waivers before embarking on submersible journeys.

Central idea

• Hope Dwindling for Titan Submersible: The Titan submersible lost all crew in an underwater implosion.
• Indigenous Indian Submersible: Indian scientists are preparing to undertake a similar dive in an indigenous vehicle called Matsya-6000.

What is Samudrayaan Mission?

• Samudrayaan is a mega mission related to the ocean/sea-launched in October 2021.
• It is aimed to develop “a self-propelled manned submersible to carry three human beings to a water depth of 6,000 meters in the ocean with a suite of scientific sensors and tools for deep ocean exploration.
• It seeks to carry out deep ocean exploration of non-living resources such as polymetallic manganese nodules, gas hydrates, hydro-thermal sulfides, and cobalt crusts, located at a depth between 1000 and 5500 meters.

About MATSYA 6000

• Developed indigenously, MATSYA 6000 is a manned submersible vehicle.
• It will facilitate the Ministry of Earth Sciences (MoES) in conducting deep ocean exploration.
• It has an endurance of 12 hours of operational period and 96 hours in case of emergency, according to the ANI news agency.
• The manned submersible will allow scientific personnel to observe and understand unexplored deep-sea areas by direct intervention.

Design specifications

• Titanium Enclosure: Matsya-6000 features a titanium casing on the front and back, chosen over carbon fiber for enhanced safety.
• Syntactic Foam: The submersible is equipped with syntactic foam, a flotation device that helps determine its location even if it cannot resurface.

Need for such a mission

• Huge coastline: India has a unique maritime position, a 7517 km long coastline, which is home to nine coastal states and 1,382 islands.
• Blue Economy: The mission aims to boost the Central government’s vision of ‘New India’ that highlights the Blue Economy as one of the ten core dimensions of growth.
• Coastal Economy: For India, with its three sides surrounded by the oceans and around 30% of the nation’s population living in coastal areas and coastal regions play a major economic factor. It supports fisheries and aquaculture, tourism, livelihoods, and blue trade.

Lessons learned from Titan Submersible

• Precautions in Place: The Indian scientists working on Matsya-6000 assure multiple back-up safety measures for the crew.
• Safety System Reviews: There may be reviews of the employed safety systems in light of the Titan submersible incident.
• Test Dives and Depth Limit: Prior to the main dives, NIOT divers will undertake test dives up to 500 meters inside a steel submersible.
• Titanium vs. Steel: Titanium, being stronger yet lighter than steel, is preferred for resurfacing ease and balancing extreme ocean depths.
• Spherical Hull Perfection: The submersible’s hull must be perfectly spherical to evenly distribute extreme pressure at ocean depths.

Impact on Safety Measures

• Reviewing Safety Measures: The incident involving the Titan submersible prompts a reevaluation and rechecking of safety measures for the Matsya-6000 mission.
• Incorporating Lessons Learned: The accident serves as a learning opportunity to enhance the safety and reliability of the upcoming Indian mission.