Quantum Correlation Experiments with Resonance Fluorescence
... emitted as packets of light. Einstein then implied in a rate-equation model of the energy exchange between light and a black-body, that these light packets, which were later called photons, can be absorbed and spontaneously or stimulated emitted by atoms. It was then the use of the stimulated emissi ...
... emitted as packets of light. Einstein then implied in a rate-equation model of the energy exchange between light and a black-body, that these light packets, which were later called photons, can be absorbed and spontaneously or stimulated emitted by atoms. It was then the use of the stimulated emissi ...
Optics and Quantum Electronics - Research Laboratory of Electronics
... precise frequency stability (frequency combs), and low timing noises (timing synchronization), to name only a few. However, to fulfill the requirement of these applications, the employed laser systems often need to be pushed to their performance limits, which can be problematic. As a result, develop ...
... precise frequency stability (frequency combs), and low timing noises (timing synchronization), to name only a few. However, to fulfill the requirement of these applications, the employed laser systems often need to be pushed to their performance limits, which can be problematic. As a result, develop ...
Application research and analysis based on Bitlocker
... based on the entire sector as the processing unit and it has strong protective capability.Because of prior treatment to the key of the entire sector which brought the performance overhead the processing speed is affected. For the AES-CBC+ElephantDiffuser algorithm adopted by Bitlocker, it is used in ...
... based on the entire sector as the processing unit and it has strong protective capability.Because of prior treatment to the key of the entire sector which brought the performance overhead the processing speed is affected. For the AES-CBC+ElephantDiffuser algorithm adopted by Bitlocker, it is used in ...
80, 032307 (2009)
... However, a quantum system cannot be completely isolated from the environment, leading to unavoidable decoherence for quantum states. Therefore a critical question is how to suppress the decoherence to a desired level for various applications. In this paper, we consider the suppression of the phase d ...
... However, a quantum system cannot be completely isolated from the environment, leading to unavoidable decoherence for quantum states. Therefore a critical question is how to suppress the decoherence to a desired level for various applications. In this paper, we consider the suppression of the phase d ...
Luttinger Liquids
... To actually calculate the Fourier transform of this expression to extract the momentum distribution N(p) discussed in the context of Fermi liquids, is a bit complicated. The result is however, as expected, that the discontinuity totally disappears, which shows that there are no stable gapless charge ...
... To actually calculate the Fourier transform of this expression to extract the momentum distribution N(p) discussed in the context of Fermi liquids, is a bit complicated. The result is however, as expected, that the discontinuity totally disappears, which shows that there are no stable gapless charge ...
Probing a Single Isolated Electron: New Measurements
... with an isolated elementary particle, quantum nondemolition (QND) measurements show that the electron stays in the ground state of its cyclotron motion for hours, leaving only in response to resonant photons deliberately introduced from outside. At higher temperatures, blackbody photons are present ...
... with an isolated elementary particle, quantum nondemolition (QND) measurements show that the electron stays in the ground state of its cyclotron motion for hours, leaving only in response to resonant photons deliberately introduced from outside. At higher temperatures, blackbody photons are present ...
Quantum speedup of the Travelling Salesman Problem for bounded
... be certain which branch leads to that leaf. Some heuristic approaches, by performing amplitude amplification on part of the tree, can produce better speedups for certain trees, but do not provide a general speedup on the same level as the quantum backtracking algorithm [16]. It is also worth underst ...
... be certain which branch leads to that leaf. Some heuristic approaches, by performing amplitude amplification on part of the tree, can produce better speedups for certain trees, but do not provide a general speedup on the same level as the quantum backtracking algorithm [16]. It is also worth underst ...
Quantum fluctuations in modulated nonlinear oscillators Vittorio Peano and M I Dykman
... Here, Wmn are the rates of interstate transitions; anm ≡ hn|a|mi. We disregard tunneling when defining functions |ni ≡ ψn (Q), i.e. we use the wave functions localized about the extrema of g(Q, P); the effect of tunneling is exponentially small for λ 1 and |n − m| λ−1 . We count the localized st ...
... Here, Wmn are the rates of interstate transitions; anm ≡ hn|a|mi. We disregard tunneling when defining functions |ni ≡ ψn (Q), i.e. we use the wave functions localized about the extrema of g(Q, P); the effect of tunneling is exponentially small for λ 1 and |n − m| λ−1 . We count the localized st ...
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.