Canonical Phase Measurements in the Presence of Photon Loss (2008)
Chiruvelli, Aravind, Lee, Hwang
We analyze the optimal state, as given by Berry and Wiseman [Phys. Rev. Lett {\bf 85}, 5098, (2000)], under the canonical phase measurement in the presence of photon loss. The model of photon loss is...
Phase measurement using a lossless Mach-Zehnder interferometer with certain entangled $N$-photon states can lead to a phase sensitivity of the order of 1/N, the Heisenberg limit. However, previously...
Coherent Communication with Linear Optics (2007)
Wilde, Mark M., Brun, Todd A., Dowling, Jonathan P., Lee, Hwang
We show how to implement several continuous-variable coherent protocols with linear optics. Noise can accumulate when implementing each coherent protocol with realistic optical devices. Our analysis...
Optimizing Optical Quantum Logic Gates using Genetic Algorithms (2007)
Wu, Zhanghan, Huver, Sean D., Uskov, Dmitry, Lee, Hwang, Dowling, Jonathan P.
We introduce the method of using an annealing genetic algorithm to the numerically complex problem of looking for quantum logic gates which simultaneously have highest fidelity and highest success...
Wilde, Mark M., Spedalieri, Federico, Dowling, Jonathan P., Lee, Hwang
We design a controlled-phase gate for linear optical quantum computing by using photodetectors that cannot resolve photon number. An intrinsic error-correction circuit corrects errors introduced by...
High-fidelity linear optical quantum computing with polarization encoding (2005)
Spedalieri, Federico M., Lee, Hwang, Dowling, Jonathan P.
We show that the KLM scheme [Knill, Laflamme and Milburn, Nature {\bf 409}, 46] can be implemented using polarization encoding, thus reducing the number of path modes required by half. One of the...
Quantum Interferometric Sensors (2005)
Kapale, Kishore T., Didomenico, Leo D., Lee, Hwang, Kok, Pieter, Dowling, Jonathan P.
Quantum entanglement has the potential to revolutionize the entire field of interferometric sensing by providing many orders of magnitude improvement in interferometer sensitivity. The...
Quantum Computing, Metrology, and Imaging (2005)
Lee, Hwang, Lougovski, Pavel, Dowling, Jonathan P.
Information science is entering into a new era in which certain subtleties of quantum mechanics enables large enhancements in computational efficiency and communication security. Naturally, precise...
Spedalieri, Federico M., Lee, Hwang, Florescu, Marian, Kapale, Kishore T., Yurtsever, Ulvi, Dowling, Jonathan P.
We devise a new technique to enhance transmission of quantum information through linear optical quantum information processors. The idea is based on applying the Quantum Zeno effect to the process of...
Towards Linear Optical Quantum Computers (2004)
Dowling, Jonathan P., Franson, James D., Lee, Hwang, Milburn, Gerald J.
Scalable quantum computation with linear optics was considered to be impossible due to the lack of efficient two-qubit logic gates, despite its ease of implementation of one-qubit gates. Two-qubit...
This article characterizes the Modernization of EC competition law as an economization, whereas most pieces concentrate on its procedural and structural aspects. Moreover, it attempts to relate the...
From Linear Optical Quantum Computing to Heisenberg-Limited Interferometry (2003)
Lee, Hwang, Kok, Pieter, Williams, Colin P., Dowling, Jonathan P.
The working principles of linear optical quantum computing are based on photodetection, namely, projective measurements. The use of photodetection can provide efficient nonlinear interactions between...
Towards photostatistics from photon-number discriminating detectors (2003)
Lee, Hwang, Yurtsever, Ulvi H., Kok, Pieter, Hockney, George M., Adami, Christoph, Braunstein, Samuel L., ...
We study the properties of a photodetector that has a number-resolving capability. In the absence of dark counts, due to its finite quantum efficiency, photodetection with such a detector can only...
Quantum Imaging and Metrology (2003)
Lee, Hwang, Kok, Pieter, Dowling, Jonathan P.
The manipulation of quantum entanglement has found enormous potential for improving performances of devices such as gyroscopes, clocks, and even computers. Similar improvements have been demonstrated...
An All Linear Optical Quantum Memory Based on Quantum Error Correction (2003)
Gingrich, Robert M., Kok, Pieter, Lee, Hwang, Vatan, Farrokh, Dowling, Jonathan P.
When photons are sent through a fiber as part of a quantum communication protocol, the error that is most difficult to correct is photon loss. Here, we propose and analyze a two-to-four qubit...
Single photons on demand from 3D photonic band-gap structures (2002)
Florescu, Marian, Scheel, Stefan, Haeffner, Hartmut, Lee, Hwang, Strekalov, Dmitry V., Knight, Peter L., ...
We describe a practical implementation of a (semi-deterministic) photon gun based on stimulated Raman adiabatic passage pumping and the strong enhancement of the photonic density of states in a...
Narrowing of electromagnetically induced transparency resonance in a Doppler-broadened medium (2002)
Javan,Ali, Kocharovskaya,Olga, Lee,Hwang, Scully,Marlan O.
We derive an analytic expression for the linewidth of electromagnetically induced transparency (EIT) resonance in a Doppler-broadened system. It is shown here that for relatively low intensity of the...
Lee, Hwang, Rostovtsev, Yuri, Bednar, Chris J., Javan, Ali
Laser induced line narrowing effect, discovered more than thirty years ago, can also be applied to recent studies in high resolution spectroscopy based on electromagnetically induced transparency. In...
A Quantum Rosetta Stone for Interferometry (2002)
Lee, Hwang, Kok, Pieter, Dowling, Jonathan P.
Heisenberg-limited measurement protocols can be used to gain an increase in measurement precision over classical protocols. Such measurements can be implemented using, e.g., optical Mach-Zehnder...
Kok, Pieter, Lee, Hwang, Dowling, Jonathan P.
Optical quantum nondemolition devices can provide essential tools for quantum information processing. Here, we describe several optical interferometers that signal the presence of a single photon in...
Narrowing of electromagnetically induced transparency resonance in a Doppler-broadened medium (2002)
Javan, Ali, Kocharovskaya, Olga, Lee, Hwang, Scully, Marlan O.
We derive an analytic expression for the linewidth of electromagnetically induced transparency (EIT) resonance in a Doppler-broadened system. It is shown here that for relatively low intensity of the...
The creation of large photon-number path entanglement conditioned on photodetection (2001)
Kok, Pieter, Lee, Hwang, Dowling, Jonathan P.
Large photon-number path entanglement is an important resource for enhanced precision measurements and quantum imaging. We present a general constructive protocol to create any large photon number...
Lee, Hwang, Kok, Pieter, Cerf, Nicolas J., Dowling, Jonathan P.
We propose a method for preparing maximal path entanglement with a definite photon number N, larger than two, using projective measurements. In contrast with the previously known schemes, our method...
Narrowing of EIT resonance in a Doppler Broadened Medium (2001)
Javan, Ali, Kocharovskaya, Olga, Lee, Hwang, Scully, Marlan O.
We derive an analytic expression for the linewidth of EIT resonance in a Doppler broadened system. It is shown here that for relatively low intensity of the driving field the EIT linewidth is...