BEGIN:VCALENDAR
VERSION:2.0
PRODID:Icfo
X-PUBLISHED-TTL:P1W
BEGIN:VEVENT
UID:69d5a0993ac50
DTSTART:20250115T110000Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20250115T120000Z
LOCATION:Mir-Puig Seminar Room (MPSMR) (MP210)
SUMMARY:ICFO | GUILLEM MÜLLER RIGAT
CLASS:PUBLIC
DESCRIPTION:Quantum metrology employs entanglement to enhance measurement p
 recision. The focus and progress so far have primarily centered on estimat
 ing a single parameter. In diverse application scenarios\, the estimation 
 of more than one single parameter is often required. Joint estimation of m
 ultiple parameters can benefit from additional advantages for further enha
 nced precision. Here we report quantum-enhanced measurement of simultaneou
 s spin rotations around two orthogonal axes\, making use of spin-nematic s
 queezing in an atomic Bose-Einstein condensate. Aided by the&nbsp\;F=2&nbs
 p\;atomic ground hyperfine manifold coupled to the nematic-squeezed&nbsp\;
 F=1&nbsp\;states as an auxiliary field through a sequence of microwave (MW
 ) pulses\, simultaneous measurement of multiple spin-1 observables is demo
 nstrated\, reaching an enhancement of 3.3 to 6.3 decibels (dB) beyond the 
 classical limit over a wide range of rotation angles. Our work realizes th
 e first enhanced multi-parameter estimation using entangled massive partic
 les as a probe. The techniques developed and the protocols implemented als
 o highlight the application of two-mode squeezed vacuum states in quantum-
 enhanced sensing of noncommuting spin rotations simultaneously.
DTSTAMP:20260408T002601Z
END:VEVENT
END:VCALENDAR