Net+ Chapter 1
... – An SSL session begins with the SSL handshake process. – The handshake process is an exchange of messages that the server uses to authenticate itself to the client using a public key. – The client and the server cooperate to create symmetric keys that will be used for the encryption, decryption, an ...
... – An SSL session begins with the SSL handshake process. – The handshake process is an exchange of messages that the server uses to authenticate itself to the client using a public key. – The client and the server cooperate to create symmetric keys that will be used for the encryption, decryption, an ...
Consciousness and Quantum Theory: Strange Bedfellows Barry Loewer
... The nature of consciousness and the interpretation of quantum mechanics are two subjects that excite great interest. Even more exciting then is the idea percolating through certain quarters that there are deep and significant connections between the two. Among those who have advocated a quantum mech ...
... The nature of consciousness and the interpretation of quantum mechanics are two subjects that excite great interest. Even more exciting then is the idea percolating through certain quarters that there are deep and significant connections between the two. Among those who have advocated a quantum mech ...
Physics Today - Portland State University
... two holes in it, as shown in the figure. These holes confine the escaping decay particles to either of a pair of opposite directions. The decay particles can pass either through holes A and A' or through holes B and B'. We can then write the state of the two-particle system as \f> = (1/V2")(|a>1 |a' ...
... two holes in it, as shown in the figure. These holes confine the escaping decay particles to either of a pair of opposite directions. The decay particles can pass either through holes A and A' or through holes B and B'. We can then write the state of the two-particle system as \f> = (1/V2")(|a>1 |a' ...
Abstraction as * file
... space. In this process the heat diffusion is considered only along momenta. We write down the modified Kramers equation describing this situation. In this model, the usual quantum description arises as asymptotics of this process for large values of resistance of the medium per unit of mass of parti ...
... space. In this process the heat diffusion is considered only along momenta. We write down the modified Kramers equation describing this situation. In this model, the usual quantum description arises as asymptotics of this process for large values of resistance of the medium per unit of mass of parti ...
powerpoint
... superposition and a mixture of states of angular momentum. Mixture: a homogeneous distribution in all directions ...
... superposition and a mixture of states of angular momentum. Mixture: a homogeneous distribution in all directions ...
Nonparametric estimation of the purity of a quantum state in
... In quantum mechanics, the quantum state of a system completely describes all aspects of the system. The instantaneous state of a quantum system encodes the probabilities of its measurable properties, or "observables" (examples of observables include energy, position, momentum and angular momentum). ...
... In quantum mechanics, the quantum state of a system completely describes all aspects of the system. The instantaneous state of a quantum system encodes the probabilities of its measurable properties, or "observables" (examples of observables include energy, position, momentum and angular momentum). ...
Quantum Numbers
... • The energy of the ejected electron is equal to the "surplus” energy that the photon had • If the light is intense, more photons strike the metal, and more electrons are ejected (if the frequency is high enough), but their energy remain the same • Nobel Prize 1921 ...
... • The energy of the ejected electron is equal to the "surplus” energy that the photon had • If the light is intense, more photons strike the metal, and more electrons are ejected (if the frequency is high enough), but their energy remain the same • Nobel Prize 1921 ...
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.