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We are developing an experimental setup to deterministically create single photons using spontaneous downconversion. We expect our source to output a single photon with a probability of 70%, and two photons with less than 3%.
We present a quantum random number generator based on randomness in photon emission and detection. Using a single-photon counter and FPGA-based data processing allows for a convenient implementation that outputs data at 40 Mbit/s.
Using ldquoquantum weak-measurementsrdquo as a coherent enhancement technique for small signals, we have measured the recently proposed ldquospin Hall effectrdquo of light at an air-glass interface, and are working on the smoothly varying refractive-index case.
Producing photons entangled independently in orbital angular-momentum, polarization, and energy-time, we realize a source of ldquohyperrdquo-entanglement. Such a source enables new quantum communication capabilities. We propose and demonstrate remote tunable preparation of entangled states.
Visible light photon counters (VLPCs) and solid-state photomultipliers (SSPMs) facilitate efficient single-photon detection. We are attempting to improve their efficiency, previously limited to > 88% by coupling losses, via anti-reflection coatings, better electronics and cryogenics.
Frequency up- and down-conversion in nonlinear crystals enables several fundamental resources for optical quantum information, including on-demand single photons, entangled-photon states, and efficient conversion of photons' quantum states from one wavelength to another
Summary form only given. Quantum cryptography uses single photons to allow secure distribution of secret key material to sender and receiver, without the possibility of an undetected eavesdropper. In the protocol suggested by Ekert, each photon of a quantum-mechanically entangled pair is sent to the sender and receiver, who randomly measure the polarization in various bases. If the bases are the same,...
Summary form only given. Entangled states of multi-particle systems are arguably the quintessential feature of quantum mechanics. In addition to their central role in discussions of non-local quantum correlations, they form the basis of quantum information, and enable such phenomena as quantum cryptography, quantum dense coding, teleportation, and quantum computation. Via the process of spontaneous...
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