Indian Researchers Redefine Noise In Quantum Computing
Noise in quantum computing
Indian scientists claim quantum noise, often considered detrimental, can sometimes boost, revive, or even create quantum entanglement. This discovery will revolutionise quantum physics and technology. This study suggests that noise may be a “uncharacteristic friend” to vulnerable quantum systems, challenging the long-held belief that it is usually harmful.
Researchers at the Raman Research Institute (RRI), an independent organisation under the Department of Science and Technology (DST), Government of India, led the groundbreaking study on intraparticle entanglement, a lesser-known type of quantum entanglement. The Indian Institute of Science, Indian Institute of Science Education and Research – Kolkata, and the University of Calgary assisted.
Noise and Entanglement Reversed
The “enemy” of entangled systems has traditionally been quantum noise, or random interruptions. Decoherence systems losing their entanglement due to the loss of fragile quantum linkages—is its major effect. Quantum physics relies on strange particle interactions outside space called quantum entanglement. Einstein famously called it remote spooky action.
This new study disproves that. The scientists observed that intraparticle entanglement functioned differently than traditional interparticle entanglement, which decays under noise without creation or recovery. The mysterious relationships between a particle's features are the subject of this lesser-known cousin of quantum entanglement.
The findings show that intraparticle entanglement is more immune to noise. It appears that intraparticle entanglement is more robust and resilient to ambient noise than interparticle entanglement. Intraparticle entanglement degraded slower in all three noise channel types.
Entanglement Creation and Revival Benefits
One of the most amazing discoveries is that noise may sustain and repair lost intraparticle entanglement. To their surprise, noise can cause entanglement in unentangled intraparticle systems. Under certain conditions, noise can actively build quantum correlations rather than destroy them. These revival and creation processes were particularly noticed under amplitude damping conditions, which imitate energy loss in a quantum system, akin to an excited quantum state relaxing to its ground state. Amplitude damping showed intraparticle entanglement's “most surprising benefits”.
Innovative Models and Strict Procedures
To study this complex behaviour, the researchers created a precise mathematical equation for “concurrence,” a key entanglement parameter. This formula predicts entanglement's behaviour based on the input quantum state and noise intensity. Dr. Animesh Sinha Roy, the article's author and RRI Post-Doctoral Fellow, noted that this mathematical statement “admits an elegant geometric representation” as well.
Most crucially, the study used a novel Global Noise Model. This model considers the particle as a whole, unlike most previous models that treated system components separately. This method is more physically realistic since a particle's fundamental features interact with its environment.
The scientists methodically examined three common quantum noises:
Amplitude damping means energy loss.
Complex phase connections needed for quantum interference are disrupted by phase damping.
Depolarising noise randomly changes quantum states in all directions.
Wide-ranging Quantum Technology Effects
The amazing ability of intraparticle entanglement to survive and recover in noisy situations suggests that it may be used to develop more resilient and effective quantum systems. This robustness will shape quantum computing and communication in the future.
Professor Urbasi Sinha, RRI's Quantum Information and Computing (QuIC) group head, underlined the next essential steps for this research. She remarked, “Our study lays down the general framework for decoherence in intraparticle entanglement. Next, apply this to specific physical systems to make this more realistic. They are testing intraparticle entanglement and single photons for quantum computing and communication. The results apply to photons, neutrons, and trapped ions since they are very independent of physical configuration.
A quantum science “Indeed a Breakthrough”
Prof. Dipankar Home, a quantum entanglement expert at the Bose Institute for Kolkata, called this discovery “indeed a breakthrough”. He says this new sort of entanglement “promises to open up uncharted avenues for user-friendly, commercially viable cutting-edge quantum technological applications”.
The Frontiers in Quantum Science and Technology project, financed by the DST's National Quantum Mission (NQM) and the India-Trento Programme on Advanced Research, questions a fundamental quantum physics premise. It illustrates that quantum science has many unresolved questions, offering up new avenues for research and innovation.