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UID:6a31dd5521b6f
DTSTART:20260625T100000Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20260625T110000Z
LOCATION:Blue Lecture Room 
SUMMARY:ICFO | RAKTIM HALDAR
CLASS:PUBLIC
DESCRIPTION:Quantum sources: Integrated photonics has recently become a lea
 ding platform for the realization and processing of optical entangled quan
 tum states in compact\, robust and scalable chip formats\, with applicatio
 ns in long-distance quantum-secured communication\, quantum-accelerated in
 formation processing and nonclassical metrology. However\, the quantum lig
 ht sources developed so far have relied on external bulky excitation laser
 s\, making them impractical prototype devices that are not reproducible\, 
 hindering their scalability and transfer out of the laboratory into real-w
 orld applications. Here we demonstrate a fully integrated quantum light so
 urce that overcomes these challenges through the integration of a laser ca
 vity\, a highly efficient tunable noise suppression filter (&gt\;55 dB) ex
 ploiting the Vernier effect\, and a nonlinear microring for entangled phot
 on-pair generation through spontaneous four-wave mixing. The hybrid quantu
 m source employs an electrically pumped InP gain section and a Si3N4 low-l
 oss microring filter system\, and demonstrates high performance parameters
 \, that is\, pair emission over four resonant modes in the telecom band (b
 andwidth of ~1 THz) and a remarkable pair detection rate of ~620 Hz at a h
 igh coincidence-to-accidental ratio of ~80. The source directly creates hi
 gh-dimensional frequency-bin entangled quantum states (qubits/qudits)\, as
  verified by quantum interference measurements with visibilities up to 96%
  (violating Bell&rsquo\;s inequality) and by density matrix reconstruction
  through state tomography\, showing fidelities of up to 99%. Our approach\
 , leveraging a hybrid photonic platform\, enables scalable\, commercially 
 viable\, low-cost\, compact\, lightweight and field-deployable entangled q
 uantum sources\, quintessential for practical\, out-of-laboratory applicat
 ions such as in quantum processors and quantum satellite communications sy
 stems.Other works: Further\, the speaker would discuss a few interesting t
 opics and his current researches at IIT Bhubaneswar on quantum frequency c
 omb-based unidirectional quantum walk\, hybrid entanglement between quantu
 m frequency comb and squeezed Kerr comb\, post quantum cryptography\, and 
 so on.
DTSTAMP:20260616T233341Z
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