Quantum channels and their capacities: An introduction
... a quote by Wojciech Zurek: Indeed, quantum computing inevitably poses questions that probe to the very core of the distinction between quantum and classical. (...) Questions originally asked for the most impractical of reasons - questions about the EPR paradox, the quantum-to-classical transition, ...
... a quote by Wojciech Zurek: Indeed, quantum computing inevitably poses questions that probe to the very core of the distinction between quantum and classical. (...) Questions originally asked for the most impractical of reasons - questions about the EPR paradox, the quantum-to-classical transition, ...
Proton tomography with Wigner distributions
... The quantum-mechanical uncertainty principle restrict the amount of localization that a Wigner distribution might have. This yields a “fuzzy” phase-space description of the system compared to the “sharp” determination of its momentum and coordinates separately. Wigner distribution provides an appeal ...
... The quantum-mechanical uncertainty principle restrict the amount of localization that a Wigner distribution might have. This yields a “fuzzy” phase-space description of the system compared to the “sharp” determination of its momentum and coordinates separately. Wigner distribution provides an appeal ...
Defining and Measuring Multi-partite Entanglement
... This figure shows Pmax as a function of the number of iterations, for different number of quantum bits needed in the quantum register (6 to 12). It can be seen that during the operation of the algorithm entanglement is created, and then removed. It returns to zero exactly at the time when the measur ...
... This figure shows Pmax as a function of the number of iterations, for different number of quantum bits needed in the quantum register (6 to 12). It can be seen that during the operation of the algorithm entanglement is created, and then removed. It returns to zero exactly at the time when the measur ...
Network Security For Distributed Simulation Systems
... Derived from both the data and the signer, who has the public key Does not guarantee the signer is the owner of the public key This can be guaranteed by the use of Digital Certificates Identity Certificates (eg X.509) - public key and sufficient data to identify the key holder Accreditation - I ...
... Derived from both the data and the signer, who has the public key Does not guarantee the signer is the owner of the public key This can be guaranteed by the use of Digital Certificates Identity Certificates (eg X.509) - public key and sufficient data to identify the key holder Accreditation - I ...
The One Mind Model of Consciousness and Quantum Reality: A
... brain macrostates, each composed of some number of observationally equivalent microstates. As the theory goes, all possible positions of the photon create a distinct universe. The other alternative is that a particular position is observed and then becomes the same for all observers, as, for ex ...
... brain macrostates, each composed of some number of observationally equivalent microstates. As the theory goes, all possible positions of the photon create a distinct universe. The other alternative is that a particular position is observed and then becomes the same for all observers, as, for ex ...
Quantum-teleportation benchmarks for independent and identically
... sufficiently strong sense, then statistical problems about the qubits model can be reformulated in terms of the Gaussian one, without any loss of optimality. In quantum statistics this technique has been used for optimal state estimation with completely unknown finite dimensional quantum states [19, ...
... sufficiently strong sense, then statistical problems about the qubits model can be reformulated in terms of the Gaussian one, without any loss of optimality. In quantum statistics this technique has been used for optimal state estimation with completely unknown finite dimensional quantum states [19, ...
Comparison of Genetic Algorithm and Quantum Genetic Algorithm
... selection operation has as goal to elect some number of individuals to enable reproduction. The cross-over operation can be performed by exchanging some parts of selected individuals in random positions which leads to create a new set of chromosomes replacing the old ones. Before repeating the proce ...
... selection operation has as goal to elect some number of individuals to enable reproduction. The cross-over operation can be performed by exchanging some parts of selected individuals in random positions which leads to create a new set of chromosomes replacing the old ones. Before repeating the proce ...
Quantum circuits for strongly correlated quantum systems
... process could be done over a scan of the parameter and scan the magnetization 具x典 for any qubit as well as a measure of three- and four-body correlations functions. ...
... process could be done over a scan of the parameter and scan the magnetization 具x典 for any qubit as well as a measure of three- and four-body correlations functions. ...
(pdf)
... At this point, we should not try to ascribe a physical meaning to fn (x); it will be more productive for us to think of |ni as a vector in L2 than explicitly as a function. 1.2. Observables. An observable of a system is a property of the system derived from a physical measurement on the system. Exam ...
... At this point, we should not try to ascribe a physical meaning to fn (x); it will be more productive for us to think of |ni as a vector in L2 than explicitly as a function. 1.2. Observables. An observable of a system is a property of the system derived from a physical measurement on the system. Exam ...
Aharonov-Bohm-type quantum interference effects in narrow gap
... underlying AB and AAS oscillations. The Fourier spectra reveal a splitting at the h/e peaks (inset Fig. 1), which has been observed previously in other systems and attributed to a SOI induced Berry’s phase [3,4,5]. The magnitude of the splitting depends on the Rashba coefficient, allowing a comparis ...
... underlying AB and AAS oscillations. The Fourier spectra reveal a splitting at the h/e peaks (inset Fig. 1), which has been observed previously in other systems and attributed to a SOI induced Berry’s phase [3,4,5]. The magnitude of the splitting depends on the Rashba coefficient, allowing a comparis ...
David Deutsch-CONSTRUCTOR THEORY
... their new paper Deutsch and Marletto define a classical information medium as one in which states can all be precisely copied. They then work out which tasks must be possible in such a system to remain in line with Shannon’s theory. The collaborators then go on to define the concept of a “superin ...
... their new paper Deutsch and Marletto define a classical information medium as one in which states can all be precisely copied. They then work out which tasks must be possible in such a system to remain in line with Shannon’s theory. The collaborators then go on to define the concept of a “superin ...
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.