Coherent ultrafast measurement of time-bin encoded photons.

Time-bin encoding is a robust form of optical quantum information, especially for transmission in optical fibers. To readout the information, the separation of the time bins must be larger than the detector time resolution, typically on the order of nanoseconds for photon counters. In the present work, we demonstrate a technique using a nonlinear interaction between chirped entangled time-bin photons and shaped laser pulses to perform projective measurements on arbitrary time-bin states with picosecond-scale separations. We demonstrate a tomographically complete set of time-bin qubit projective measurements and show the fidelity of operations is sufficiently high to violate the Clauser-Horne-Shimony-Holt-Bell inequality by more than 6 standard deviations.

[1]  Kumar,et al.  Observation of quantum frequency conversion. , 1992, Physical review letters.

[2]  N. Gisin,et al.  Tunable upconversion photon detector , 2008, 0807.3399.

[3]  K. Abbink,et al.  24 , 1871, You Can Cross the Massacre on Foot.

[4]  A. Beveratos,et al.  Cross time-bin photonic entanglement for quantum key distribution , 2013 .

[5]  K. J. Resch,et al.  Dispersion-cancelled biological imaging with quantum-inspired interferometry , 2013, Scientific reports.

[6]  V Malka,et al.  Efficient generation of narrow-bandwidth picosecond pulses by frequency doubling of femtosecond chirped pulses. , 1998, Optics letters.

[7]  Edo Waks,et al.  Ultra-bright source of polarization-entangled photons , 1999 .

[8]  Jagdeep Shah,et al.  Ultrafast luminescence spectroscopy using sum frequency generation , 1988 .

[9]  J. Bell.  On the Einstein-Podolsky-Rosen paradox , 1964 .

[10]  I. Ross,et al.  Efficient tuneable bandwidth frequency mixing using chirped pulses , 1999 .

[11]  W Tittel,et al.  Distribution of time-bin entangled qubits over 50 km of optical fiber. , 2004, Physical review letters.

[12]  H M Wiseman,et al.  Quantum optical waveform conversion. , 2010, Physical review letters.

[13]  Franson.  Two-photon interferometry over large distances. , 1991, Physical review. A, Atomic, molecular, and optical physics.

[14]  Logan G. Wright,et al.  Spectral compression of single photons , 2013, Nature Photonics.

[15]  O. Alibart,et al.  A photonic quantum information interface , 2005, Nature.

[16]  Wolfgang Tittel,et al.  Time-bin entangled qubits for quantum communication created by femtosecond pulses , 2002 .

[17]  Paul G. Kwiat,et al.  High efficiency single photon detection via frequency up-conversion , 2004 .

[18]  Hiroki Takesue,et al.  Implementation of quantum state tomography for time-bin entangled photon pairs. , 2009, Optics express.

[19]  A. Shimony,et al.  Proposed Experiment to Test Local Hidden Variable Theories. , 1969 .

[20]  M. Handzic.  5 , 1824, The Banality of Heidegger.

[21]  Andrew G. Glen,et al.  APPL , 2001 .

[22]  N. Gisin,et al.  Violation of Bell Inequalities by Photons More Than 10 km Apart , 1998, quant-ph/9806043.

[23]  Gisin,et al.  Quantum cryptography using entangled photons in energy-time bell states , 1999, Physical review letters.

[24]  J. Fiurášek,et al.  Quantum inference of states and processes , 2002, quant-ph/0210146.

[25]  Yaron Silberberg,et al.  Two photon absorption and coherent control with broadband down-converted light. , 2004, Physical review letters.

[26]  Christine Silberhorn,et al.  A quantum pulse gate based on spectrally engineered sum frequency generation. , 2010, Optics express.

[27]  Alexei Gilchrist,et al.  Choice of measurement sets in qubit tomography , 2007, 0706.3756.

[28]  N. Gisin,et al.  Pulsed Energy-Time Entangled Twin-Photon Source for Quantum Communication , 1999 .

[29]  I. Ali-Khan,et al.  Resonant sum frequency generation with time-energy entangled photons. , 2009, Physical review letters.

[30]  Xiao Tang,et al.  Reducing noise in single-photon-level frequency conversion. , 2013, Optics letters.

[31]  R. Hadfield.  Single-photon detectors for optical quantum information applications , 2009 .

[32]  Franson,et al.  Bell inequality for position and time. , 1989, Physical review letters.

[33]  J. Lavoie,et al.  Experimental violation of Svetlichny's inequality , 2009, 0909.0789.

[34]  E. Treacy.  Optical pulse compression with diffraction gratings , 1969 .

[35]  Anton Zeilinger,et al.  Polarization-entanglement-conserving frequency conversion of photons , 2011, 1106.1867.

[36]  J. Altepeter,et al.  High-speed tomography of time-bin-entangled photons using a single-measurement setting , 2012 .