Information Gain vs. State Disturbance in Quantum Theory
نویسندگان
چکیده
منابع مشابه
Information Gain vs. State Disturbance in Quantum Theory
The engine that powers quantum cryptography is the principle that there are no physical means for gathering information about the identity of a quantum system’s state (when it is known to be prepared in one of a set of nonorthogonal states) without disturbing the system in a statistically detectable way. This situation is often mistakenly described as a consequence of the “Heisenberg uncertaint...
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When discriminating between two pure quantum states, there exists a quantitative tradeoff between the information retrieved by the measurement and the disturbance caused on the unknown state. We derive the optimal tradeoff and provide the corresponding quantummeasurement. Such an optimal measurement smoothly interpolates between the two limiting cases of maximal information extraction and no me...
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There exists a precise tradeoff between the amount of information extracted from a quantum measurement and the amount of disturbance caused on the system, analogous to Heisenberg relations holding in the preparation procedure of a quantum state. The study of such a tradeoff is relevant for both foundation and its enormous relevance in practice, in the realm of quantum key distribution and quant...
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Ideal quantum key distribution (QKD) with qubits[1] is known to be secure[2, 3, 4, 5, 6], and the security proofs are based on what are called information-vs.-disturbance results. The basic QKD protocol involves the following steps: Alice transmits one of four possible states randomly chosen from |0〉X , |1〉X , |0〉Z , and |1〉Z , i.e., the basis vectors in the X and Z bases. The basic information...
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Recent theoretical work on solid-state proposals for the implementation of quantum computation and quantum information processing is reviewed. The differences and similarities between microscopic and macroscopic qubits are highlighted and exemplified by the spin qubit proposal on one side and the superconducting qubits on the other. Before explaining the spin and supercondcuting qubits in detai...
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ژورنال
عنوان ژورنال: Fortschritte der Physik
سال: 1998
ISSN: 0015-8208,1521-3978
DOI: 10.1002/(sici)1521-3978(199806)46:4/5<535::aid-prop535>3.0.co;2-0