Department of Physics and Physical Oceanography Sigma Pi Sigma INDUCTION
... intrinsically probabilistic. Objects have no clear position unless we look at them. Despite its strangeness, the theory of quantum mechanics has been passing all experimental tests and has been confirming various bizarre predictions. The laws of quantum mechanics rule over every atom in every piece ...
... intrinsically probabilistic. Objects have no clear position unless we look at them. Despite its strangeness, the theory of quantum mechanics has been passing all experimental tests and has been confirming various bizarre predictions. The laws of quantum mechanics rule over every atom in every piece ...
Theory of quantum light and matter Research supervisor Prof. Paul Eastham
... Advances in the areas of condensed matter, atomic physics, and optics, are uncovering new types of cooperative behaviour for electrons and photons. Examples are (a)the formation of new ordered states such as Bose-Einstein condensates; (b)the occurrence of exotic optical properties in photonic materi ...
... Advances in the areas of condensed matter, atomic physics, and optics, are uncovering new types of cooperative behaviour for electrons and photons. Examples are (a)the formation of new ordered states such as Bose-Einstein condensates; (b)the occurrence of exotic optical properties in photonic materi ...
vuletic
... The Vuletić group strives to manipulate atoms and photons in systems where the particles’ quantum nature dominates. Our work touches on quantum measurement, quantum control, quantum feedback, mesoscopic systems and entanglement. ...
... The Vuletić group strives to manipulate atoms and photons in systems where the particles’ quantum nature dominates. Our work touches on quantum measurement, quantum control, quantum feedback, mesoscopic systems and entanglement. ...
Some Families of Probability Distributions Within Quantum Theory
... Barbara Heller Department of Applied Mathematics Illinois Institute of Technology ...
... Barbara Heller Department of Applied Mathematics Illinois Institute of Technology ...
Quantum Measurements PHYSICS COLLOQUIUM Klaus Mølmer
... systems, and even today there is no, commonly agreed upon, understanding of the quantum measurement problem. The experimental situation and hence the subjects of theoretical investigations have, however, been considerably refined since the early days of quantum mechanics. Without claiming a solution ...
... systems, and even today there is no, commonly agreed upon, understanding of the quantum measurement problem. The experimental situation and hence the subjects of theoretical investigations have, however, been considerably refined since the early days of quantum mechanics. Without claiming a solution ...
Quantum Cryptography
... • A user can suggest a key by sending a stream of randomly polarized photons. • This sequence can be converted to a binary key. • If the key was intercepted it could be discarded and a new stream of randomly polarized photons sent. ...
... • A user can suggest a key by sending a stream of randomly polarized photons. • This sequence can be converted to a binary key. • If the key was intercepted it could be discarded and a new stream of randomly polarized photons sent. ...
Peter Heuer - Quantum Cryptography Using Single and Entangled
... Bob in their original state, leaving no sign of her intervention. A stream of photons that are truly spatially separated is said to be antibunched. An attenuated laser beam contains bunched photons and is therefore insufficient for secure quantum communication. True single photon sources are created ...
... Bob in their original state, leaving no sign of her intervention. A stream of photons that are truly spatially separated is said to be antibunched. An attenuated laser beam contains bunched photons and is therefore insufficient for secure quantum communication. True single photon sources are created ...
Probing contextuality with superconducting quantum circuits Talk 27. Oct. 2015 ABSTRACT:
... Contextuality is one of the most fundamental property which distinguishes quantum mechanics from classical theory. It has also been suggested to be the 'magical' resource responsible for an exponential speedup of a quantum computer. We will provide the first experimental evidence of this resource fo ...
... Contextuality is one of the most fundamental property which distinguishes quantum mechanics from classical theory. It has also been suggested to be the 'magical' resource responsible for an exponential speedup of a quantum computer. We will provide the first experimental evidence of this resource fo ...
Single Photon Polarization
... 1. Alice tosses a coin several times and notes out come each time (i.e. generates a random sequence of 0s and 1s.) 2. If it is head she decides to encode using a horizontal/verical basis. If it is a tail, she encodes in 45/135 basis. 3. Each bit is encoded as 0 or 1 in the chosen basis. 4. Bob recei ...
... 1. Alice tosses a coin several times and notes out come each time (i.e. generates a random sequence of 0s and 1s.) 2. If it is head she decides to encode using a horizontal/verical basis. If it is a tail, she encodes in 45/135 basis. 3. Each bit is encoded as 0 or 1 in the chosen basis. 4. Bob recei ...
History and the State-of-art in Quantum Computation
... History and the State-of-art in Quantum Computation ...
... History and the State-of-art in Quantum Computation ...
Quantum key distribution
Quantum key distribution (QKD) uses quantum mechanics to guarantee secure communication. It enables two parties to produce a shared random secret key known only to them, which can then be used to encrypt and decrypt messages. It is often incorrectly called quantum cryptography, as it is the most well known example of the group of quantum cryptographic tasks.An important and unique property of quantum key distribution is the ability of the two communicating users to detect the presence of any third party trying to gain knowledge of the key. This results from a fundamental aspect of quantum mechanics: the process of measuring a quantum system in general disturbs the system. A third party trying to eavesdrop on the key must in some way measure it, thus introducing detectable anomalies. By using quantum superpositions or quantum entanglement and transmitting information in quantum states, a communication system can be implemented which detects eavesdropping. If the level of eavesdropping is below a certain threshold, a key can be produced that is guaranteed to be secure (i.e. the eavesdropper has no information about it), otherwise no secure key is possible and communication is aborted.The security of encryption that uses quantum key distribution relies on the foundations of quantum mechanics, in contrast to traditional public key cryptography which relies on the computational difficulty of certain mathematical functions, and cannot provide any indication of eavesdropping at any point in the communication process, or any mathematical proof as to the actual complexity of reversing the one-way functions used. QKD has provable security based on information theory, and forward secrecy.Quantum key distribution is only used to produce and distribute a key, not to transmit any message data. This key can then be used with any chosen encryption algorithm to encrypt (and decrypt) a message, which can then be transmitted over a standard communication channel. The algorithm most commonly associated with QKD is the one-time pad, as it is provably secure when used with a secret, random key. In real world situations, it is often also used with encryption using symmetric key algorithms like the Advanced Encryption Standard algorithm. In the case of QKD this comparison is based on the assumption of perfect single-photon sources and detectors, that cannot be easily implemented.