Spin Squeezing on an Atomic Clock Transition.
... individual particles constitutes a fundamental source of noise that limits the precision of the measurement7–9 at the standard quantum limit (SQL). The SQL is the fundamental limit for measurements with ensembles of uncorrelated particles. However, quantum mechanics allows one to redistribute the qu ...
... individual particles constitutes a fundamental source of noise that limits the precision of the measurement7–9 at the standard quantum limit (SQL). The SQL is the fundamental limit for measurements with ensembles of uncorrelated particles. However, quantum mechanics allows one to redistribute the qu ...
Data security based on multipath routing.
... Intrusion Detection in Ad hoc networks Every node in the ad-hoc network participates in intrusion detection and response. Each node is responsible for detecting signs of intrusion locally and independently. Neighboring nodes can collaboratively investigate in a ...
... Intrusion Detection in Ad hoc networks Every node in the ad-hoc network participates in intrusion detection and response. Each node is responsible for detecting signs of intrusion locally and independently. Neighboring nodes can collaboratively investigate in a ...
Chapter 15. - Portland State University
... configuration is lower than the desired cost threshold (cost bound). This is the search result that we are looking for. If it is zero means that either color rule (no two adjacent notes in same color) is violated, or that the desired color number is not achieved or that both these conditions violate ...
... configuration is lower than the desired cost threshold (cost bound). This is the search result that we are looking for. If it is zero means that either color rule (no two adjacent notes in same color) is violated, or that the desired color number is not achieved or that both these conditions violate ...
Quantum Lambda Calculus - Department of Mathematics and
... possible context. For example, the term M N only makes sense if M is a function; the term let hx, yi = M in N only makes sense when M is a pair; the term match P with (x 7→ M | y 7→ N ) only makes sense when P is a member of a disjoint union; and the term meas M only makes sense if M is a quantum bi ...
... possible context. For example, the term M N only makes sense if M is a function; the term let hx, yi = M in N only makes sense when M is a pair; the term match P with (x 7→ M | y 7→ N ) only makes sense when P is a member of a disjoint union; and the term meas M only makes sense if M is a quantum bi ...
- City Research Online
... function of the number operator N . One may consider various types of Hamiltonian systems, either Hermitian or non-Hermitian, and replace the original standard canonical variables (x0 , p0 ), obeying [x0 , p0 ] = i~, by (X, P ). It is crucial to note that even when the undeformed Hamiltonian is Herm ...
... function of the number operator N . One may consider various types of Hamiltonian systems, either Hermitian or non-Hermitian, and replace the original standard canonical variables (x0 , p0 ), obeying [x0 , p0 ] = i~, by (X, P ). It is crucial to note that even when the undeformed Hamiltonian is Herm ...
Spin-to-orbital conversion of the angular momentum of light and its
... kinds of quantum manipulations of single photons, as has been demonstrated in a series of experiments mainly performed by Sciarrino and co-workers in Roma’s quantum optics group, which will be reviewed below. In particular, as we will show, the combined use of polarization and OAM for accessing a hi ...
... kinds of quantum manipulations of single photons, as has been demonstrated in a series of experiments mainly performed by Sciarrino and co-workers in Roma’s quantum optics group, which will be reviewed below. In particular, as we will show, the combined use of polarization and OAM for accessing a hi ...
Introduction to Quantum Computing (2010) (e-book)
... allowed in classical system (for example, factoring large numbers, or achieving dimensional sizes of physical devices that are comparable to quantum dimensions, such as the atoms), as well as the achievement of a new level of security of the information. KSV’s book, [KSV02], address to this question ...
... allowed in classical system (for example, factoring large numbers, or achieving dimensional sizes of physical devices that are comparable to quantum dimensions, such as the atoms), as well as the achievement of a new level of security of the information. KSV’s book, [KSV02], address to this question ...
- Quantum Optics Group
... kinds of quantum manipulations of single photons, as has been demonstrated in a series of experiments mainly performed by Sciarrino and co-workers in Roma’s quantum optics group, which will be reviewed below. In particular, as we will show, the combined use of polarization and OAM for accessing a hi ...
... kinds of quantum manipulations of single photons, as has been demonstrated in a series of experiments mainly performed by Sciarrino and co-workers in Roma’s quantum optics group, which will be reviewed below. In particular, as we will show, the combined use of polarization and OAM for accessing a hi ...
A minus sign that used to annoy me but now I know why it is there
... Abstract. We consider two well known constructions of link invariants. One uses skein theory: you resolve each crossing of the link as a linear combination of things that don’t cross, until you eventually get a linear combination of links with no crossings, which you turn into a polynomial. The othe ...
... Abstract. We consider two well known constructions of link invariants. One uses skein theory: you resolve each crossing of the link as a linear combination of things that don’t cross, until you eventually get a linear combination of links with no crossings, which you turn into a polynomial. The othe ...
Impurity and soliton dynamics in a Fermi gas with nearest
... directions. The density profiles in Fig. 2 show an excitation as an additional DW. We can verify that the two excitations propagate symmetrically by studying the correlation of density on both sides of j0 , as is done in the Supplemental Material [47]. The symmetric propagation results in the comple ...
... directions. The density profiles in Fig. 2 show an excitation as an additional DW. We can verify that the two excitations propagate symmetrically by studying the correlation of density on both sides of j0 , as is done in the Supplemental Material [47]. The symmetric propagation results in the comple ...
Fractional @ Scaling for Quantum Kicked Rotors without Cantori
... been well studied both experimentally and theoretically. An important exception to the integer scaling law for L, with L @2=3 , was found in the seminal theoretical study of quantum behavior in the vicinity of so-called ‘‘golden cantori’’ in [6]. At a critical value of kT 0:97, the last classica ...
... been well studied both experimentally and theoretically. An important exception to the integer scaling law for L, with L @2=3 , was found in the seminal theoretical study of quantum behavior in the vicinity of so-called ‘‘golden cantori’’ in [6]. At a critical value of kT 0:97, the last classica ...
... Closed-orbit theory is a semiclassical method for calculating photoabsorption cross sections. This method is based on the observation that to calculate this cross section it is only necessary to obtain the Green’s function for points near the nucleus when the initial state is compact. Thus in a semi ...
Optical Properties of Low Dimensional Semiconductor Materials
... about the properties of matter through many different spectroscopies that cover a wide range of wavelengths. This dissertation presents a serial study about the optical properties of different semiconductor materials. It is motivated by the fact that semiconductors are extremely important in modern ...
... about the properties of matter through many different spectroscopies that cover a wide range of wavelengths. This dissertation presents a serial study about the optical properties of different semiconductor materials. It is motivated by the fact that semiconductors are extremely important in modern ...
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.