5.11 Harmonic Oscillator
... Classically, half the photons should be detected at A, half at B. Experimentally, all of the photons reach A. The photon wave “travels” both paths at once, and interference at the second beamsplitter gives this result. The ability of a quantum system to contain information about many states simultae ...
... Classically, half the photons should be detected at A, half at B. Experimentally, all of the photons reach A. The photon wave “travels” both paths at once, and interference at the second beamsplitter gives this result. The ability of a quantum system to contain information about many states simultae ...
Pogosov_Abstract - Superconducting hybrid nanostructures
... Quantum electrodynamics (QED) of superconducting circuits is one of fast and intensively developing fields of a modern physics. The interest to superconducting circuits, which consist of Josephson qubits and transmission line cavities, is heated by the possibility of implementation of quantum comput ...
... Quantum electrodynamics (QED) of superconducting circuits is one of fast and intensively developing fields of a modern physics. The interest to superconducting circuits, which consist of Josephson qubits and transmission line cavities, is heated by the possibility of implementation of quantum comput ...
Chapter 7: Quantum Mechanical Model of Atom
... • Werner Heisenberg - showed that it is impossible to know (or measure) precisely both the position and velocity (or the momentum) at the same time. • The simple act of “seeing” an electron would change ...
... • Werner Heisenberg - showed that it is impossible to know (or measure) precisely both the position and velocity (or the momentum) at the same time. • The simple act of “seeing” an electron would change ...
What is Quantum Computation? - IC
... State space of single (qu)bit ☺ Much more information in qubit than c-bit Measurement can only yield one classical bit • Choose basis (x/y, left/right, etc) representing orthogonal polarisations (antipodal points on Bloch sphere) • Find photon in one or other channel with certain probability ...
... State space of single (qu)bit ☺ Much more information in qubit than c-bit Measurement can only yield one classical bit • Choose basis (x/y, left/right, etc) representing orthogonal polarisations (antipodal points on Bloch sphere) • Find photon in one or other channel with certain probability ...
ppt - Computer Science
... splitter, that comfortable notion isn’t a very good way to understand the system Better is to think of information moving from place A to place B and not worrying about “when” at all ...
... splitter, that comfortable notion isn’t a very good way to understand the system Better is to think of information moving from place A to place B and not worrying about “when” at all ...
Lecture Notes (pptx)
... splitter, that comfortable notion isn’t a very good way to understand the system Better is to think of information moving from place A to place B and not worrying about “when” at all ...
... splitter, that comfortable notion isn’t a very good way to understand the system Better is to think of information moving from place A to place B and not worrying about “when” at all ...
A Unique Quantum Random Number Generator using Bosonic
... based on stochastic noise or chaotic dynamics in a suitable physical system. Computational PRNGs are based on computational algorithms that generate sequences of numbers of very long periodicity, making them look like true random numbers for sufficiently short sequences. Careful observation over lon ...
... based on stochastic noise or chaotic dynamics in a suitable physical system. Computational PRNGs are based on computational algorithms that generate sequences of numbers of very long periodicity, making them look like true random numbers for sufficiently short sequences. Careful observation over lon ...
Lecture
... Solution of the above differential equation satisfying the boundary conditions exist only when ...
... Solution of the above differential equation satisfying the boundary conditions exist only when ...
Quantum chaos: an introduction
... •System can get “trapped” for very long times in regions of cantori. These are the fractal remnants of invarient tori. •K = 1.0; i.e. last torus has been destroyed (K=0.97..). ...
... •System can get “trapped” for very long times in regions of cantori. These are the fractal remnants of invarient tori. •K = 1.0; i.e. last torus has been destroyed (K=0.97..). ...
Quantum Computing - Computer Science
... • Unlike contemporary encoding, quantum key is dynamic • The first steps in the process do not involve the actual message • The new key isn’t used unless Bob’s bitstring is ~50% or more error free • In order to create the Key from Alice’s and Bob’s bitstrings, the strings are compared and the correc ...
... • Unlike contemporary encoding, quantum key is dynamic • The first steps in the process do not involve the actual message • The new key isn’t used unless Bob’s bitstring is ~50% or more error free • In order to create the Key from Alice’s and Bob’s bitstrings, the strings are compared and the correc ...
Winter 2006 Colloquium Series Physics Department University of Oregon 4:00 Thursdays, 100 Willamette
... experimental efforts, however, have been devoted to discrete variables, and more importantly, there has been no conclusive evidence in favor of quantum mechanics mainly due to experimental loopholes. In this talk, we will take some theoretical considerion of continuous variables (CVs) as the origina ...
... experimental efforts, however, have been devoted to discrete variables, and more importantly, there has been no conclusive evidence in favor of quantum mechanics mainly due to experimental loopholes. In this talk, we will take some theoretical considerion of continuous variables (CVs) as the origina ...
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.