A reasonable thing that just might work Abstract Daniel Rohrlich
... quantum mechanics. For example, pairs of photons measured at spacelike separations may yield nonlocal quantum correlations, i.e. correlations that cannot be traced to any data or “programs” the photons carry with them. As Bell [3] put it 20 years later, “For me, it is so reasonable to assume that th ...
... quantum mechanics. For example, pairs of photons measured at spacelike separations may yield nonlocal quantum correlations, i.e. correlations that cannot be traced to any data or “programs” the photons carry with them. As Bell [3] put it 20 years later, “For me, it is so reasonable to assume that th ...
The exotic world of quantum matter
... condense into ordered states featuring spontaneous symmetry breaking and supporting a zoo of new “quasiparticles”. The search for new types of order in new (artificially synthesized) materials with novel properties not encountered in nature goes on. • More recently the search is focussing on “exotic ...
... condense into ordered states featuring spontaneous symmetry breaking and supporting a zoo of new “quasiparticles”. The search for new types of order in new (artificially synthesized) materials with novel properties not encountered in nature goes on. • More recently the search is focussing on “exotic ...
Quantum enhanced metrology and the geometry of quantum channels
... Entanglement enhanced precision Hong-Ou-Mandel interference ...
... Entanglement enhanced precision Hong-Ou-Mandel interference ...
Quantum theory as a method: the epistemic
... Quantum theory as a method: the epistemic conception of quantum states ...
... Quantum theory as a method: the epistemic conception of quantum states ...
Document
... 4. How much work must be done to pull apart the electron and the proton that make up the hydrogen atom if the atom is initially in (a) its ground state and (b) the state with n = 2? ANSWER: (a) 13.6 eV; (b) 3.40 eV 5. What is the probability that in the ground state of the hydrogen atom, the electro ...
... 4. How much work must be done to pull apart the electron and the proton that make up the hydrogen atom if the atom is initially in (a) its ground state and (b) the state with n = 2? ANSWER: (a) 13.6 eV; (b) 3.40 eV 5. What is the probability that in the ground state of the hydrogen atom, the electro ...
Photon quantum mechanics and beam splitters
... and detect such photon pairs. Two devices, the down converter and the avalanche photodiode, provide the technology that makes our experiments feasible. Correlated pairs can be created with a down converter, a crystal specially cut to exploit its birefringence and its nonlinear properties so that a s ...
... and detect such photon pairs. Two devices, the down converter and the avalanche photodiode, provide the technology that makes our experiments feasible. Correlated pairs can be created with a down converter, a crystal specially cut to exploit its birefringence and its nonlinear properties so that a s ...
pdf
... Fundamental particles are divided into bosons and fermions depending on their internal angular momentum, or ‘spin’. If the total spin is an integer multiple of Planck’s constant, h, divided by 2, the particle is a boson. An ultracold ensemble of these particles can condense into the lowest possible ...
... Fundamental particles are divided into bosons and fermions depending on their internal angular momentum, or ‘spin’. If the total spin is an integer multiple of Planck’s constant, h, divided by 2, the particle is a boson. An ultracold ensemble of these particles can condense into the lowest possible ...
Smolin - Bell paper - International Journal of Quantum Foundations
... I would ilke to begin with Bell’s remark on the possibility that the beables are non-local, which Tim Maudlin quotes. “Of course, we may be obliged to develop theories in which there are no strictly local beables. That possibility will not be considered here[1].” When I read that yesterday I was ast ...
... I would ilke to begin with Bell’s remark on the possibility that the beables are non-local, which Tim Maudlin quotes. “Of course, we may be obliged to develop theories in which there are no strictly local beables. That possibility will not be considered here[1].” When I read that yesterday I was ast ...
PHY140Y 32 The Pauli Exclusion Principle
... to the atom, one found that the electrons appeared to occupy increasingly higher-energy “shells,” with two electrons per shell. This led to the following principle: You could not have two or more electrons occupying the same quantum state. Known as the “Pauli Exclusion Principle,” this ansatz proved ...
... to the atom, one found that the electrons appeared to occupy increasingly higher-energy “shells,” with two electrons per shell. This led to the following principle: You could not have two or more electrons occupying the same quantum state. Known as the “Pauli Exclusion Principle,” this ansatz proved ...
poster
... e.g., The Double-Slit Experiment • The intensity of the beam can be tuned down to the point where ...
... e.g., The Double-Slit Experiment • The intensity of the beam can be tuned down to the point where ...
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.