Reply to criticism of the ‘Orch OR qubit’ – ‘Orchestrated... reduction’ is scientifically justified
... Ambient energy, electric fields and mechanical vibrations pump coherence (as occurs in photosynthesis, and as suggested by Fröhlich). Most importantly, apparent quantum coherence up to 10−4 s has been shown by Bandyopadhyay’s group [10,11] to occur in single microtubules at warm temperature, which m ...
... Ambient energy, electric fields and mechanical vibrations pump coherence (as occurs in photosynthesis, and as suggested by Fröhlich). Most importantly, apparent quantum coherence up to 10−4 s has been shown by Bandyopadhyay’s group [10,11] to occur in single microtubules at warm temperature, which m ...
Turing Machines
... established laws of classical physics and called for a radically different way of thinking --this led to the development of Quantum Mechanics which is today regarded as the fundamental theory of Nature The price to be paid for this powerful tool is that some of the predictions that Quantum Mechanics ...
... established laws of classical physics and called for a radically different way of thinking --this led to the development of Quantum Mechanics which is today regarded as the fundamental theory of Nature The price to be paid for this powerful tool is that some of the predictions that Quantum Mechanics ...
Quantum measurements of coupled systems * L. Fedichkin, M. Shapiro,
... way so as to suppress resonant excitation transitions. Localizing multiple excitations is far more complicated, because the number of states exponentially increases with the number of excitations. However, at least for a one-dimensional qubit system, by tuning n one can obtain a long “localization ...
... way so as to suppress resonant excitation transitions. Localizing multiple excitations is far more complicated, because the number of states exponentially increases with the number of excitations. However, at least for a one-dimensional qubit system, by tuning n one can obtain a long “localization ...
A continued fraction resummation form of bath
... quantum dissipation can lead to rich quantum phenomena, e.g., quantum phase transition.1 The spin-boson (CaldeiraLeggett) model is a simple but fundamental quantum system, which can be used to interpret the quantum tunneling and localization in macroscopic systems.2,3 Gate operations in quantum comp ...
... quantum dissipation can lead to rich quantum phenomena, e.g., quantum phase transition.1 The spin-boson (CaldeiraLeggett) model is a simple but fundamental quantum system, which can be used to interpret the quantum tunneling and localization in macroscopic systems.2,3 Gate operations in quantum comp ...
1 Why do we need position operator in quantum theory?
... reasons. For macroscopic bodies this effect is extremely small (see Sec. 3) while in experiments on the Earth with atoms and elementary particles spreading does not have enough time to manifest itself. However, it seems rather strange that no one has posed a problem of what happens to photons from d ...
... reasons. For macroscopic bodies this effect is extremely small (see Sec. 3) while in experiments on the Earth with atoms and elementary particles spreading does not have enough time to manifest itself. However, it seems rather strange that no one has posed a problem of what happens to photons from d ...
Homodyne balanced receiver (BPSK)
... The signal to noise performance is halved compared to the BPSK homodyne case (due to the 90 deg hybrid which results in a 3 dB drop to the input optical signal) . Thus to achieve the same SER/BER of 10 -9, the input number of photons/bits must be doubled, or equal to 18 (from 1/2*erfc(SQRT(Nphotons) ...
... The signal to noise performance is halved compared to the BPSK homodyne case (due to the 90 deg hybrid which results in a 3 dB drop to the input optical signal) . Thus to achieve the same SER/BER of 10 -9, the input number of photons/bits must be doubled, or equal to 18 (from 1/2*erfc(SQRT(Nphotons) ...
5.3 Atomic Emission Spectra and the Quantum Mechanical Model
... states that it is impossible to know both the velocity and the position of a particle at the same time. • This limitation is critical when dealing with small particles such as electrons. • But it does not matter for ordinary-sized objects such as cars or airplanes. ...
... states that it is impossible to know both the velocity and the position of a particle at the same time. • This limitation is critical when dealing with small particles such as electrons. • But it does not matter for ordinary-sized objects such as cars or airplanes. ...
On Radiative Weak Annihilation Decays
... to be treacherous if one cannot track the processes through which the quarks of various flavors are created or destroyed. Such ambiguities plague the extraction of Cabibbo-Kobayashi-Maskawa (CKM) elements from nonleptonic weak decays. In this light, processes with unusual flavor quantum numbers are ...
... to be treacherous if one cannot track the processes through which the quarks of various flavors are created or destroyed. Such ambiguities plague the extraction of Cabibbo-Kobayashi-Maskawa (CKM) elements from nonleptonic weak decays. In this light, processes with unusual flavor quantum numbers are ...
Quasiclassical Coarse Graining and Thermodynamic Entropy∗
... is made natural by our limited powers of observation and computation. But in the modern quantum mechanics of closed systems, some measure of coarse graining is inescapable because there are no non-trivial, probabilistic, fine-grained descriptions. This essay explores the consequences of that fact. Q ...
... is made natural by our limited powers of observation and computation. But in the modern quantum mechanics of closed systems, some measure of coarse graining is inescapable because there are no non-trivial, probabilistic, fine-grained descriptions. This essay explores the consequences of that fact. Q ...
Our (represented) World: A Quantum
... The approach can be viewed as a reversal of standard QM in the following sense. A person considers a classical object e.g., a state agency, but her knowledge about it i.e., the mental picture in her mind can behave in a non-classical way. Since human beings makes decisions on the basis of perceived ...
... The approach can be viewed as a reversal of standard QM in the following sense. A person considers a classical object e.g., a state agency, but her knowledge about it i.e., the mental picture in her mind can behave in a non-classical way. Since human beings makes decisions on the basis of perceived ...
Quantum Mechanics as Quantum Information (and only a little more)
... with our experimental kicks to it).5 The structure called quantum mechanics is about the interplay of these two things—the subjective and the objective. The task before us is to separate the wheat ...
... with our experimental kicks to it).5 The structure called quantum mechanics is about the interplay of these two things—the subjective and the objective. The task before us is to separate the wheat ...
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.