Private Quantum Channels
... Now let us consider the analogous situation in the quantum world. Alice and Bob are connected by a one-way quantum channel, to which an eavesdropper Eve has complete access. Alice wants to transmit to Bob some n-qubit state taken from some set S , without allowing Eve to obtain any information abo ...
... Now let us consider the analogous situation in the quantum world. Alice and Bob are connected by a one-way quantum channel, to which an eavesdropper Eve has complete access. Alice wants to transmit to Bob some n-qubit state taken from some set S , without allowing Eve to obtain any information abo ...
Hadamard Gates - UW
... C-not Gates are one of the basic 2-qubit gates in quantum computing. C-not is short for controlled not, which means that one qubit (target qubit) is flipped if the other qubit (control qubit) is |1>, otherwise the target qubit is left alone. The mathematical representation of a C-Not Gate is below. ...
... C-not Gates are one of the basic 2-qubit gates in quantum computing. C-not is short for controlled not, which means that one qubit (target qubit) is flipped if the other qubit (control qubit) is |1>, otherwise the target qubit is left alone. The mathematical representation of a C-Not Gate is below. ...
ppt
... S. L. Braunstein, C. M. Caves, and G. J. Milburn, Ann. Phys. 247, 135 (1996). V. Giovannetti, S. Lloyd, and L. Maccone, PRL 96, 041401 (2006). ...
... S. L. Braunstein, C. M. Caves, and G. J. Milburn, Ann. Phys. 247, 135 (1996). V. Giovannetti, S. Lloyd, and L. Maccone, PRL 96, 041401 (2006). ...
Presentation (PowerPoint File)
... 4. Stability: Long decoherence times, together with the ability to suppress decoherence through error correction and fault-tolerant computation. 5. Measurement: The ability to read out the state of the computer in a convenient product basis. ...
... 4. Stability: Long decoherence times, together with the ability to suppress decoherence through error correction and fault-tolerant computation. 5. Measurement: The ability to read out the state of the computer in a convenient product basis. ...
Physics 214 Lecture 11
... cannot occupy the same quantum state. (exclusion principle) Photons (and many atoms) are bosons. Unlike fermions, bosons actually ―prefer‖ (to be explained soon) to be in the same quantum state. This is the physical principle on which lasers are based. ...
... cannot occupy the same quantum state. (exclusion principle) Photons (and many atoms) are bosons. Unlike fermions, bosons actually ―prefer‖ (to be explained soon) to be in the same quantum state. This is the physical principle on which lasers are based. ...
![Physics 521: Quantum Mechanics (Dr. Adolfo Eguiluz) [.pdf]](http://s1.studyres.com/store/data/008805653_1-47e70238c21d6c860f07a611c35478ec-300x300.png)
Physics 521: Quantum Mechanics (Dr. Adolfo Eguiluz) [.pdf]
... will switch almost completely to Sakurai as the course progresses. Sakurai will also be the textbook for Physics 522, where the second volume of Cohen-Tannoudji will be used as occasional reference —it contains many important problems worked out in great detail! Finally, I always recommend the Feynm ...
... will switch almost completely to Sakurai as the course progresses. Sakurai will also be the textbook for Physics 522, where the second volume of Cohen-Tannoudji will be used as occasional reference —it contains many important problems worked out in great detail! Finally, I always recommend the Feynm ...
Conference version
... We can do this in the special case k=2, using DFKO What’s the best quantum/classical query complexity separation for sampling problems? ...
... We can do this in the special case k=2, using DFKO What’s the best quantum/classical query complexity separation for sampling problems? ...
Ontology in Quantum Darwinism
... BUT: There’s not and cannot be Iteration: Not all environments are good in this role of a communicational channel channel. Photons excel: They do not interact with the air or with each other, faithfully passing on information. ...
... BUT: There’s not and cannot be Iteration: Not all environments are good in this role of a communicational channel channel. Photons excel: They do not interact with the air or with each other, faithfully passing on information. ...
Lecture 1
... 2. More efficient than with single ions: the photons that change the collective mode go in the forward direction (this requires a high optical thickness). ...
... 2. More efficient than with single ions: the photons that change the collective mode go in the forward direction (this requires a high optical thickness). ...
Quantum Theory of What - University of Virginia
... Question: How does consciousness fit into all of this? • Consciousness, as pure nonphysical awareness, is assumed in one interpretation. • Consciousness as an emergent property of matter is assumed in other interpretations (but matter-based consciousness has no creative power!). • Consciousness is ...
... Question: How does consciousness fit into all of this? • Consciousness, as pure nonphysical awareness, is assumed in one interpretation. • Consciousness as an emergent property of matter is assumed in other interpretations (but matter-based consciousness has no creative power!). • Consciousness is ...
What`s new with NOON States
... • Forward Problem for the LOQSG out which can be Determine a set of output states generated using different ancilla resources. • Inverse Problem for the LOQSG U generating required Determine linear optical matrix out target state . • Optimization Problem for the Inverse Problem Out of all poss ...
... • Forward Problem for the LOQSG out which can be Determine a set of output states generated using different ancilla resources. • Inverse Problem for the LOQSG U generating required Determine linear optical matrix out target state . • Optimization Problem for the Inverse Problem Out of all poss ...
Atomic and Molecular Physics for Physicists Ben-Gurion University of the Negev
... 1. Show that if a phase shifter (adding phase α) is introduced into one of the arms of the MZ from the previous slide, the photon detection probability in the bright detector goes like ½ (1+cos2α) 2. Explain why two photons meeting at a beam splitter always go together to One of the sides (a process ...
... 1. Show that if a phase shifter (adding phase α) is introduced into one of the arms of the MZ from the previous slide, the photon detection probability in the bright detector goes like ½ (1+cos2α) 2. Explain why two photons meeting at a beam splitter always go together to One of the sides (a process ...
Phys202_Exam3_2006.doc
... 15. If an object is 6 m from the mirror, then how far from the mirror will the object distance be? a. 3 b. 6 c. ~1/3 d. 1/6 ...
... 15. If an object is 6 m from the mirror, then how far from the mirror will the object distance be? a. 3 b. 6 c. ~1/3 d. 1/6 ...
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.