Two recent studies have shown promising progress in the field of time travel and quantum physics. Researchers from Washington University in St. Louis, NIST, and the University of Cambridge published separate papers on time-traveling quantum sensors using entangled qubits.
In the first study, Kater Murch and colleagues demonstrated a new type of quantum sensor that uses quantum entanglement for time-traveling detectors. The process involves subjecting one qubit (probe) to a magnetic field rotation and measuring the ancillary qubit, which effectively sends its quantum state 'back in time' to the probe.
Under normal circumstances, there is a one-in-three chance of failure when measuring magnetic fields due to nullified results. However, hindsight allows experimenters to set the best direction for spin measurement through time travel.
Applications for these sensors include detecting astronomical phenomena and studying magnetic fields.
In the second study, researchers from the University of Science and Technology of China (USTC) and the University of Hong Kong constructed a coherent superposition of quantum evolution with two opposite directions in a photonic system. They achieved this by extending time reversal to the input-output inversion of a quantum device.
The resulting evolution satisfied the time-reversal properties of the initial evolution, thus obtaining a time-reversal simulator for quantum evolution.
These studies reveal potential advancements in our understanding and application of quantum physics. However, it is important to note that these findings are still theoretical and require further research before they can be practically implemented.
