Experimental Test of Wave-Particle Duality by Single Neutral Atoms
... Various tests of BCP with single photons have been performed [2–10]. However, the low detection efficiency associated with fast-moving, massless photons makes the results less persuasive and quite untenable. Here we use a well-controlled, massive, single trapped Cesium atom in a Ramsey interferomete ...
... Various tests of BCP with single photons have been performed [2–10]. However, the low detection efficiency associated with fast-moving, massless photons makes the results less persuasive and quite untenable. Here we use a well-controlled, massive, single trapped Cesium atom in a Ramsey interferomete ...
Nonlinear Quantum Optics in a Waveguide: Distinct Single Photons Strongly
... strong control beam, i.e., jj2 > ab bc , tuned in resonance with the jbi ! jci transition creates a transparency window for a single photon. Here and thereafter, is the Rabi frequency of the control beam. In order to avoid intensity saturation effects, the incident single photon rate should be ...
... strong control beam, i.e., jj2 > ab bc , tuned in resonance with the jbi ! jci transition creates a transparency window for a single photon. Here and thereafter, is the Rabi frequency of the control beam. In order to avoid intensity saturation effects, the incident single photon rate should be ...
by Chao Shen - Deep Blue
... elusive. In fact, a great number of quantum information protocols have been demonstrated with small scaled systems. The remaining task is to build large scale practical devices. However it turns out that scaling up is highly nontrivial in the quantum world. A protocol valid in principle could face e ...
... elusive. In fact, a great number of quantum information protocols have been demonstrated with small scaled systems. The remaining task is to build large scale practical devices. However it turns out that scaling up is highly nontrivial in the quantum world. A protocol valid in principle could face e ...
A Study of the Phenomenon of Spontaneous Parametric Down
... entangled photons is spontaneous parametric downconversion (SPDC). SPDC was described as early as 1970 by D. C. Burnham and D.L. Weinberg [3]. Experiments using this technique were first prevalent in 1980 and with an advancement in equipment and technology several experiments have been conducted usi ...
... entangled photons is spontaneous parametric downconversion (SPDC). SPDC was described as early as 1970 by D. C. Burnham and D.L. Weinberg [3]. Experiments using this technique were first prevalent in 1980 and with an advancement in equipment and technology several experiments have been conducted usi ...
Introduction to Quantum Computation
... is of course negligible compared to the heat generated by other dissipative processes such as the flow of current through a resistance. As we will see later, one important ...
... is of course negligible compared to the heat generated by other dissipative processes such as the flow of current through a resistance. As we will see later, one important ...
Lower Bounds for Quantum Search and Derandomization
... would expect a quantum computer to be able to achieve error ≤ 1/2 using roughly k applications of the RP-machine. Somewhat surprisingly, we show that a quantum computer cannot do much better than the classical computer: it would also need at least ck applications of the machine to obtain error ≤ 1/2 ...
... would expect a quantum computer to be able to achieve error ≤ 1/2 using roughly k applications of the RP-machine. Somewhat surprisingly, we show that a quantum computer cannot do much better than the classical computer: it would also need at least ck applications of the machine to obtain error ≤ 1/2 ...
Strongly correlated phenomena in cavity QED
... managed to overcome the previous difficulty by using a quantum trick: • Suppose there are only two witnesses { 1 , 2 } acceptance probability bigger than 2/3 (all other having acceptance prob. < 1/3) ...
... managed to overcome the previous difficulty by using a quantum trick: • Suppose there are only two witnesses { 1 , 2 } acceptance probability bigger than 2/3 (all other having acceptance prob. < 1/3) ...
PPT - Fernando Brandao
... managed to overcome the previous difficulty by using a quantum trick: • Suppose there are only two witnesses { 1 , 2 } acceptance probability bigger than 2/3 (all other having acceptance prob. < 1/3) ...
... managed to overcome the previous difficulty by using a quantum trick: • Suppose there are only two witnesses { 1 , 2 } acceptance probability bigger than 2/3 (all other having acceptance prob. < 1/3) ...
in PPT
... mix with phase-locked PDC source at 50/50 BS Note: TPA case: classical in nonlinearity quantum out this case: classical in + quantum in interference quantum out ...
... mix with phase-locked PDC source at 50/50 BS Note: TPA case: classical in nonlinearity quantum out this case: classical in + quantum in interference quantum out ...
Quantum nanophotonic phase switch with a single atom.
... changes sign depending on the presence (g . 1) or absence (g 5 0) of a strongly coupled atom. If the atom is prepared in a superposition of internal states, one of which does not couple to the cavity mode (for example another hyperfine atomic sublevel), the phase of the atomic superposition is switc ...
... changes sign depending on the presence (g . 1) or absence (g 5 0) of a strongly coupled atom. If the atom is prepared in a superposition of internal states, one of which does not couple to the cavity mode (for example another hyperfine atomic sublevel), the phase of the atomic superposition is switc ...
Impossibility of the Counterfactual Computation for All Possible
... there is a high probability that the outcome is 0, but there is not any reason to claim that in this case there has been a counterfactual computation, since at every period part of the photon wave went through the computer device. The probability to absorb the photon by the computer in ...
... there is a high probability that the outcome is 0, but there is not any reason to claim that in this case there has been a counterfactual computation, since at every period part of the photon wave went through the computer device. The probability to absorb the photon by the computer in ...
Probabilistic instantaneous quantum computation
... she has already fed them into her quantum computer. Because the set of unitary transformations necessary to complete the usual teleportation procedure and her computation do not always commute, in general she has to invert the full quantum computation performed so far, perform the singlequbit transf ...
... she has already fed them into her quantum computer. Because the set of unitary transformations necessary to complete the usual teleportation procedure and her computation do not always commute, in general she has to invert the full quantum computation performed so far, perform the singlequbit transf ...
Beam Splitter Input
... Assume now that the obstructing object is placed in path 1. The reduced density matrix is then ...
... Assume now that the obstructing object is placed in path 1. The reduced density matrix is then ...
On realism and quantum mechanics
... interesting. For a detailed discussion, showing also that even classically it is not possible to say which is the energy path between the slits and the screen, one might see [6]. (2 ) Also classical electromagnetism does, of course, a similar thing with the electric field. ...
... interesting. For a detailed discussion, showing also that even classically it is not possible to say which is the energy path between the slits and the screen, one might see [6]. (2 ) Also classical electromagnetism does, of course, a similar thing with the electric field. ...
Optical Precursor of a Single Photon
... Wave-particle duality is at the heart of quantum mechanics. To pave the way towards the realization of practical quantum information processing [1], it is crucial to understand and demonstrate the duality at the singlephoton level. The optical precursor, which refers to the propagation of the front ...
... Wave-particle duality is at the heart of quantum mechanics. To pave the way towards the realization of practical quantum information processing [1], it is crucial to understand and demonstrate the duality at the singlephoton level. The optical precursor, which refers to the propagation of the front ...
Interference with correlated photons: Five quantum mechanics
... product of the individual detector efficiencies, it is necessary to use the most efficient single-photon detectors available. These are avalanche photodiodes. Their efficiencies peak at around 80% for 700 nm photons and drop off rather quickly to below 10% for 1000 nm photons.6 Because detection eff ...
... product of the individual detector efficiencies, it is necessary to use the most efficient single-photon detectors available. These are avalanche photodiodes. Their efficiencies peak at around 80% for 700 nm photons and drop off rather quickly to below 10% for 1000 nm photons.6 Because detection eff ...
On High-Efficiency Optical Communication and Key Distribution
... and degrade easily over poor atmospheric conditions. In Section III we propose to solve this problem using simple dense (thus non-orthogonal) Gaussian beams; by using spatial PPM modulation, interference between the beams is transformed into a simple noisy channel. We present the fundamental hardwar ...
... and degrade easily over poor atmospheric conditions. In Section III we propose to solve this problem using simple dense (thus non-orthogonal) Gaussian beams; by using spatial PPM modulation, interference between the beams is transformed into a simple noisy channel. We present the fundamental hardwar ...
On High-Efficiency Optical Communication and Key Distribution
... and degrade easily over poor atmospheric conditions. In Section III we propose to solve this problem using simple dense (thus non-orthogonal) Gaussian beams; by using spatial PPM modulation, interference between the beams is transformed into a simple noisy channel. We present the fundamental hardwar ...
... and degrade easily over poor atmospheric conditions. In Section III we propose to solve this problem using simple dense (thus non-orthogonal) Gaussian beams; by using spatial PPM modulation, interference between the beams is transformed into a simple noisy channel. We present the fundamental hardwar ...
Quantum algorithms - People @ EECS at UC Berkeley
... as having two stages. In the first stage, the n classical bits of the input are “unpacked” into an exponentially large superposition, which is expressly set up so as to have an underlying pattern or regularity that, if detected, would solve the task at hand. The second stage then consists of a suita ...
... as having two stages. In the first stage, the n classical bits of the input are “unpacked” into an exponentially large superposition, which is expressly set up so as to have an underlying pattern or regularity that, if detected, would solve the task at hand. The second stage then consists of a suita ...
Seeing a single photon without destroying it
... operates on the 54.3-GHz g ) i transition (i is the circular state with principal quantum number 49). The set-up is cooled to 0.6 or 1.2 K by a helium cryostat. The average number of thermal photons in the mode at these temperatures are 0.02 and 0.15, respectively. The cavity is made of two niobium ...
... operates on the 54.3-GHz g ) i transition (i is the circular state with principal quantum number 49). The set-up is cooled to 0.6 or 1.2 K by a helium cryostat. The average number of thermal photons in the mode at these temperatures are 0.02 and 0.15, respectively. The cavity is made of two niobium ...
Quantum Probability Quantum Information Theory Quantum
... always say ‘yes’ (i.e., Pred = Pblack = ‘yes’) and that Q will answer the question ‘Is my card red?’ (i.e., Qred = ‘yes’ and Qblack = ‘no’). This will lead to a 1 in the (red,red) square or the (black,red) square or to a 0 in one of the other two. So if we would repeat this strategy very often, then ...
... always say ‘yes’ (i.e., Pred = Pblack = ‘yes’) and that Q will answer the question ‘Is my card red?’ (i.e., Qred = ‘yes’ and Qblack = ‘no’). This will lead to a 1 in the (red,red) square or the (black,red) square or to a 0 in one of the other two. So if we would repeat this strategy very often, then ...