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We report uni-traveling-carrier photodiodes with a quantum efficiency of 98% ±0.8% at 1064 nm. For $50~\mu \text{m}$ devices, the measured 3-dB bandwidth is 2 GHz and the dark current is 10 nA at a bias voltage of −5 V. The dark current is dominated by generation-recombination at a bias voltage of −10 V and the activation energy is 0.23 eV. At higher bias voltage, tunneling becomes a significant...
We report on experimental progress toward scaling our recent 60-entangled-qumode experiment [1] to thousands of qumodes in the quantum optical frequency comb. We present a model which predicts that 3,200 entangled modes can be achieved.
We extended the seminal experiment of Banaszek et al. of quantum tomography by photon counting without Radon transform postprocessing to the more general case of photon fluxes with more than one photon per detection time.
We investigate the use of the Schwinger representation for casting multimode squeezed states into multipartite spin entangled states. While the generalization is not straightforward, we can still find highly entangled multipartite spin states.
We present a simple, scalable, top-down method for entangling the quantum optical frequency comb into hypercubic-lattice continuous-variable cluster states up to a maximum size of about 104 modes using existing technology.
We observed a remarkably broad sum frequency generation quasi-phasematching bandwidth in periodically poled KTiOPO4, consistent with theory. This is key to large-size quantum computing registers by generating continuous-variable cluster states in quantum optical frequency combs.
We report progress towards information-efficient quantum imaging. We implemented a 4-mode interferometer (Fig.1) which uses both polarization and spatial encoding to image Hadamard-encoded phase arrays. We used this interferometer with a single-photon source to achieve the theoretical goal of Photon Information Efficiency (PIE)= 2 bits per photon (bpp). This demonstration is a particular case of a...
Toward the implementation of universal quantum computing in the optical frequency comb, we recently demonstrated the entanglement of 60 cavity modes of a single optical parametric oscillator into 15 independent quadripartite ring cluster states.
We report the simultaneous experimental generation of multiple quadripartite continuous-variable cluster states in the optical frequency comb of a single optical parametric oscillator operating below threshold.
We study the effect of pump depletion in a single type-I optical parametric oscillator (OPO) and find that pump-mediated, signal-field quantum correlations generate multipartite entanglement in the optical frequency comb of the OPO.
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