Triplewise information tradeoff in quantum me

Schematic diagram

image: Quantum data preservation relation and schematic diagram of quantum states subjected to ‘weak measurement’ and ‘reverting operations’ (G: info obtained by measurement, F: details remaining in quantum condition right after measurement, R: likelihood of profitable reversion)
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Credit rating: Korea Institute of Science and Technology(KIST)

‘Schrödinger’s cat’ is a considered experiment created to explain ‘quantum superposition’ and ‘quantum measurement,’ which are the core attributes of quantum physics. In this experiment, the cat within the box can be equally alive and dead at the similar time (quantum superposition), and its point out (dead or alive) is resolved the second the box is opened (calculated). These kinds of quantum superposition and measurement are not only the foundation of quantum physics, but also assurance the safety of quantum computing and cryptography.

The research team, comprising Drs. Seongjin Hong, Hyang-Tag Lim, and Seung-Woo Lee from the Middle for Quantum Data at the Korea Institute of Science and Engineering (KIST, President Seok Jin Yoon), derived and verified the information preservation relation for the to start with time in quantum measurement. This strengthens the safety of quantum info systems even in weak quantum measurement realm.

Opening the box (quantum measurement) accommodating the cat to receive info on whether or not it is dead or alive improvements the preliminary issue of the cat getting both useless and alive at the exact same time (quantum superposition) to just becoming both useless or alive. In other words, the cat is useless from the moment we attain the details of its ‘being useless,’ or is alive the instant we receive the data of its ‘being alive.’ Due to the irreversibility of quantum measurements, the cat’s condition are unable to be reversed.

Even so, what would have occurred if the measurement had not been accomplished wholly, i.e., if the box experienced been opened a minor bit only to expose the cat’s tail? This party is known as ‘weak measurement’ in quantum mechanics. In this scenario, finish information and facts on the cat’s point out can not be obtained, and the cat’s state can be reverted to its original state making use of measurement ‘reversal.’ As a result, setting up a ‘relation of quantum info preservation’ by taking into consideration the volume of attained, disturbed and reversible facts has been a challenge in quantum physics and also an essential task to make certain the security of quantum technologies.

The study group theoretically derived an information preservation relation taking into consideration the reversing chance along with the current relations of ‘information gain’ and ‘state disturbance.’ This details preservation relation was experimentally confirmed applying linear optical factors this kind of as waveplates and polarizers to implement ‘weak measurement’ and ‘reversing operations’ and by applying them to a a few-dimensional quantum point out realized by a one photon. This data preservation relation reveals that getting far more facts on a quantum condition by increasing the depth of measurement disturbs the quantum state extra. At the identical time, it is also proven that the probability of reversing the disturbed state to its first state just before weak measurement gets to be lower. It need to be pointed out that if it were being achievable to reverse a disturbed quantum state to its original point out, then the safety of quantum cryptography may possibly be not certain.

Drs. Hong and Lim, who led the experiment of this study, and Dr. Lee, who led the idea, said that “this is the final result of correctly developing that quantum technologies is secure in principle by proving that the overall quantity of facts of a quantum condition are not able to be improved even by measurement”, and that they “expect this to be used as an optimization technological innovation for quantum computing, quantum cryptography, and quantum teleportation”.




KIST was proven in 1966 as the initial governing administration-funded analysis institute to create a national improvement tactic primarily based on science and technological know-how and disseminate numerous industrial systems to establish major industries. KIST is now elevating Korean science and engineering status via planet-main ground breaking investigation and progress. For a lot more info, you should take a look at our web site at

This perform was supported by the Nationwide Study Foundation of Korea (NRF) (2019M3E4A1079777, 2019M3E4A1078660, 2020M3E4A1079939, 2021R1C1C1003625), the Institute for Facts and Communications Engineering Marketing (IITP) (2020–00947, 2020–00972), the Nationwide Research Council of Science and Technologies (NST) (CAP21031-200), and the KIST study system (2E31531), which are funded by the Ministry of Science and ICT (Minister: Hye-Sook Lim). This exploration was published on the go over of the newest challenge of the global scientific journal 「Actual physical Critique Letters」 (IF: 9.161, JCR(%) : 7.558 %).

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