File - SPHS Devil Physics
... Aims: a. Aim 1: study of quantum phenomena introduces students to an exciting new world that is not experienced at the macroscopic level. The study of tunneling is a novel phenomenon not observed in macroscopic physics. b. Aim 6: the photoelectric effect can be investigated using LEDs c. Aim 9: the ...
... Aims: a. Aim 1: study of quantum phenomena introduces students to an exciting new world that is not experienced at the macroscopic level. The study of tunneling is a novel phenomenon not observed in macroscopic physics. b. Aim 6: the photoelectric effect can be investigated using LEDs c. Aim 9: the ...
Looks like ppt is up - Louisiana Tech University
... • So Bell’s inequality must hold if we are to have one of these “it’s all built in (like classical correlations) but we just can’t see it yet” type of models that Einstein wanted. • But (for n along some directions) the quantum calculation violates Bell’s inequality. • Therefore, they can’t both be ...
... • So Bell’s inequality must hold if we are to have one of these “it’s all built in (like classical correlations) but we just can’t see it yet” type of models that Einstein wanted. • But (for n along some directions) the quantum calculation violates Bell’s inequality. • Therefore, they can’t both be ...
Quantum Communication: A real Enigma
... Require that ( IC)(AC) always be a density operator too Doesn’t come for free! Let T be the transpose map on A. If |i = |00iAC + |11iAC, then (T IC)(|ih|) has negative eigenvalues The resulting set of transformations on density operators are known as ...
... Require that ( IC)(AC) always be a density operator too Doesn’t come for free! Let T be the transpose map on A. If |i = |00iAC + |11iAC, then (T IC)(|ih|) has negative eigenvalues The resulting set of transformations on density operators are known as ...
Optical Control and Info
... in memories, information processors, or network components. In particular, we work on spins in quantum dots and diluted impurities, exploring theoretically how they can be controlled at the quantum level using a laser field. We study optically-induced spin coupling mechanisms that can be applied to ...
... in memories, information processors, or network components. In particular, we work on spins in quantum dots and diluted impurities, exploring theoretically how they can be controlled at the quantum level using a laser field. We study optically-induced spin coupling mechanisms that can be applied to ...
1 Lecture 10 Summary Phys 404 Statistical
... we are in the dilute limit, which is appropriate for the ideal gas calculation that we are about to do. On the other hand, liquid Helium at 4.2 K is a different story. There and ...
... we are in the dilute limit, which is appropriate for the ideal gas calculation that we are about to do. On the other hand, liquid Helium at 4.2 K is a different story. There and ...
Toffoli gate
... A quantum state cannot be determined via a single measurement Once converted to classical information, quantum information cannot be recovered ...
... A quantum state cannot be determined via a single measurement Once converted to classical information, quantum information cannot be recovered ...
슬라이드 1
... One can even set up quite ridiculous cases. A cat is penned up in a steel chamber, along with the following device (which must be secured against direct interference by the cat): in a Geiger counter there is a tiny bit of radioactive substance, so small, that perhaps in the course of the hour one of ...
... One can even set up quite ridiculous cases. A cat is penned up in a steel chamber, along with the following device (which must be secured against direct interference by the cat): in a Geiger counter there is a tiny bit of radioactive substance, so small, that perhaps in the course of the hour one of ...
Energy levels, photons and spectral lines
... Isaac Newton – prism and sunlight → light is a wave Interference patterns like with water → light is a wave Joseph von Fraunhofer – the Sun’s spectrum has gaps → ? Observations of gas emission and absorption spectrum → ? ...
... Isaac Newton – prism and sunlight → light is a wave Interference patterns like with water → light is a wave Joseph von Fraunhofer – the Sun’s spectrum has gaps → ? Observations of gas emission and absorption spectrum → ? ...
7.2.4. Normal Ordering
... conserved as long as the total number of photons present is always odd (or even). In other words, the number of photons is not conserved. Note that this is necessarily the case if photons are to be interpreted as quanta of electromagnetic fields. ...
... conserved as long as the total number of photons present is always odd (or even). In other words, the number of photons is not conserved. Note that this is necessarily the case if photons are to be interpreted as quanta of electromagnetic fields. ...
数学与系统科学研究院学术报告
... for quantum computation and quantum information processing. In this work we propose a novel strategy using techniques from systems theory to completely eliminate decoherence and also provide conditions under which it can be done so. A novel construction employing an auxiliary system, the bait, which ...
... for quantum computation and quantum information processing. In this work we propose a novel strategy using techniques from systems theory to completely eliminate decoherence and also provide conditions under which it can be done so. A novel construction employing an auxiliary system, the bait, which ...
PPT - University of Washington
... and |01> are not eigenstates. These states are rotated. After a time pi*hbar/2*J, we have performed half of a swap operation. This is a known universal quantum gate ...
... and |01> are not eigenstates. These states are rotated. After a time pi*hbar/2*J, we have performed half of a swap operation. This is a known universal quantum gate ...
NEW COVER SLIDE- qinfo with p & a
... If a classical computer takes input |n> to output |f(n)>, an analogous quantum computer takes a state |n>|0> and maps it to |n>|f(n)> (unitary, reversible). By superposition, such a computer takes n |n>|0> to n |n>|f(n)>; it calculates f(n) for every possible input simultaneously. A clever measure ...
... If a classical computer takes input |n> to output |f(n)>, an analogous quantum computer takes a state |n>|0> and maps it to |n>|f(n)> (unitary, reversible). By superposition, such a computer takes n |n>|0> to n |n>|f(n)>; it calculates f(n) for every possible input simultaneously. A clever measure ...
Statistical Physics
... The Boltzmann distribution is valid when e eE/kT >> 1. This can occur because of low particle densities and energies >> kT ...
... The Boltzmann distribution is valid when e eE/kT >> 1. This can occur because of low particle densities and energies >> kT ...
PowerPoint 演示文稿
... where H is the Hamiltonian. • The total wave function must be antisymmetric (or symmetric ) with respect to the interchange of all coordinates of one fermion (boson) with those of another. ...
... where H is the Hamiltonian. • The total wave function must be antisymmetric (or symmetric ) with respect to the interchange of all coordinates of one fermion (boson) with those of another. ...
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.