Answers
... 4) What is measurement-disturbance? Why do we only see it with small objects? What we choose to measure - affects what we find. This is not the kind of error that we try to minimize in an experiment. This is a fundamental limit to what it is possible to know. 5) Quantum physics is fundamentally diff ...
... 4) What is measurement-disturbance? Why do we only see it with small objects? What we choose to measure - affects what we find. This is not the kind of error that we try to minimize in an experiment. This is a fundamental limit to what it is possible to know. 5) Quantum physics is fundamentally diff ...
G-Complexity, Quantum Computation and Anticipatory Processes
... encoded paths that were not Hamiltonian. These had to be eliminated.”Yes, the output was a “sentence” in a larger “book” that contained the Hamiltonian path, and also all other paths. The account of this breakthrough computation was read by many, but understood by few. The connection between the DNA ...
... encoded paths that were not Hamiltonian. These had to be eliminated.”Yes, the output was a “sentence” in a larger “book” that contained the Hamiltonian path, and also all other paths. The account of this breakthrough computation was read by many, but understood by few. The connection between the DNA ...
Quantum interference of a single spin excitation with a
... our experiment such additional noise that is uncorrelated with the quantum state of interest [red areas (dark gray) in Fig. 3] originates from the electronic detector noise, photon shot noise [22, 29], classical fluctuations in the atomic state initialization, and the noise from the 12 reference mea ...
... our experiment such additional noise that is uncorrelated with the quantum state of interest [red areas (dark gray) in Fig. 3] originates from the electronic detector noise, photon shot noise [22, 29], classical fluctuations in the atomic state initialization, and the noise from the 12 reference mea ...
PDF
... |φ± inT = (|1in |1T ± |0in |0T )/ 2}, on the joint input-mode/transmitter system then yields the two bits of classical information that the receiver needs to reconstruct the input state. An initial experimental demonstration of teleportation using singlet states was performed by Bouwmeester et ...
... |φ± inT = (|1in |1T ± |0in |0T )/ 2}, on the joint input-mode/transmitter system then yields the two bits of classical information that the receiver needs to reconstruct the input state. An initial experimental demonstration of teleportation using singlet states was performed by Bouwmeester et ...
classical simulation of restricted quantum computations
... particles, and suggested that this type of computation might be more efficient on a computing device that takes advantage of quantum mechanical e↵ects, and that perhaps even computation in general would be more efficient on a so-called quantum computer. David Deutsch then took these ideas further in ...
... particles, and suggested that this type of computation might be more efficient on a computing device that takes advantage of quantum mechanical e↵ects, and that perhaps even computation in general would be more efficient on a so-called quantum computer. David Deutsch then took these ideas further in ...
algebraic quantization and t
... in the action (or Hamiltonian). Thus kinematical and dynamical aspects of the quantization procedure turn out to be inextricably linked to each other. The main purpose of the quantization method (yet another one!) presented in this Letter is to explain this very linkage in a transparent algebraic la ...
... in the action (or Hamiltonian). Thus kinematical and dynamical aspects of the quantization procedure turn out to be inextricably linked to each other. The main purpose of the quantization method (yet another one!) presented in this Letter is to explain this very linkage in a transparent algebraic la ...
Experimental entanglement of four particles
... and correct24. The presence of decoherence, and the fact that it affects the four-ion experiment more strongly than the two-ion one, illustrates the need to carefully define the sense in which our entanglement operation is ‘scalable’. Any entanglement experiment is more sensitive to decoherence as t ...
... and correct24. The presence of decoherence, and the fact that it affects the four-ion experiment more strongly than the two-ion one, illustrates the need to carefully define the sense in which our entanglement operation is ‘scalable’. Any entanglement experiment is more sensitive to decoherence as t ...
Parametric Poisson Process Imaging
... s(t) ∝ exp(−(|t|/a)p ), where p and a control the concavity and the spread of the pulse, respectively. The generalized Gaussian family includes Gaussian (p = 2) and near-uniform (large p) functions. Since generalized Gaussian functions are log-concave, our regularized depth estimator is obtained by ...
... s(t) ∝ exp(−(|t|/a)p ), where p and a control the concavity and the spread of the pulse, respectively. The generalized Gaussian family includes Gaussian (p = 2) and near-uniform (large p) functions. Since generalized Gaussian functions are log-concave, our regularized depth estimator is obtained by ...
Analysis of a Quantum Error Correcting Code using Quantum
... Alice is parameterized by two channels, a and b. In order to give Alice a general definition independent of the qubit to be sent to Bob, she will receive the qubit on channel a. The type of a is b[Qbit], which is the type of a channel on which each message is a qubit. Channel b is where Alice sends ...
... Alice is parameterized by two channels, a and b. In order to give Alice a general definition independent of the qubit to be sent to Bob, she will receive the qubit on channel a. The type of a is b[Qbit], which is the type of a channel on which each message is a qubit. Channel b is where Alice sends ...
Connecting processing-capable quantum memories over telecommunication links via quantum frequency conversion
... into an output of a different frequency while its quantum state is preserved. It is this state-preserving feature of SFG and DFG that enables the QFC operation. To build QFC devices compatible with the quantummemory devices described in sections 3 and 4, we consider the use of planar PPLN waveguides ...
... into an output of a different frequency while its quantum state is preserved. It is this state-preserving feature of SFG and DFG that enables the QFC operation. To build QFC devices compatible with the quantummemory devices described in sections 3 and 4, we consider the use of planar PPLN waveguides ...
Towards a Tight Finite Key Analysis for BB84
... Entropic Uncertainty Relation The entropic uncertainty relation gives a lower bound on the sum of the entropies of the two possible measurements in terms of the overlap of the measurements, c. ...
... Entropic Uncertainty Relation The entropic uncertainty relation gives a lower bound on the sum of the entropies of the two possible measurements in terms of the overlap of the measurements, c. ...
A Common Fallacy in Quantum Mechanics: Retrocausality David Ellerman
... as a calcite crystal as creating two beams with orthogonal eigenstate polarizations— rather than creating an entangled superposition state so that appropriately positioned detectors can detect only one eigenstate when the detectors cause the projections to eigenstates. One (partial) exception is Dic ...
... as a calcite crystal as creating two beams with orthogonal eigenstate polarizations— rather than creating an entangled superposition state so that appropriately positioned detectors can detect only one eigenstate when the detectors cause the projections to eigenstates. One (partial) exception is Dic ...
Science, consciousness and World-View
... something about the nature of physical reality. “Stuff” was particles, and it had a decidedly mathematical flavour, being entirely specified by mathematical quantities. Change was lawlike and governed by mathematical laws. And by the eighteenth century the world essentially had only one layer (heave ...
... something about the nature of physical reality. “Stuff” was particles, and it had a decidedly mathematical flavour, being entirely specified by mathematical quantities. Change was lawlike and governed by mathematical laws. And by the eighteenth century the world essentially had only one layer (heave ...
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.