WHATIS CLAIMED IS:
`
`-27-
`
`I.
`
`A degenerate four-wave mixing (DF WM) squeezed light apparatus comprising:
`
`one or more pump beams comprising an input power of no greater than about 150 mW;
`
`a probe beam configured to overlap the pump beam;
`
`a vapor cell comprising an atomic vapor, a first window, and a second window, wherein the
`
`atomic vapor is configured to interact with the overlapped pump and probe beams to generate an
`
`amplified probe beam and a conjugate beam,
`
`a repump beam configured to optically pump the atomic vapor to a groundstate and decrease
`
`atomic decoherence ofthe atomic vapor, and
`
`a balanceddifferential detector or joint homodyne detector configured to measure squeezing
`
`due to quantum correlations between the amplified probe beam and the conjugate beam,
`
`wherein the pump beam, the probe beam, and the repump beam are configured to reduce
`
`spontaneous emission of the atomic vapor and generate two-mode squeezed light by DFWMinthe
`
`atomic vapor with squeezing of at least 3 dB below shot noise.
`
`2.
`
`The DFWMsqueezed light apparatus of claim 1, wherein the input power of the one or more
`
`pump beamsis no greater than about SO mW.
`
`3.
`
`The DFWMsqueezed light apparatus of claim 1, wherein the input power of the one or more
`
`pump beams is no greater than about 20 mW.
`
`4.
`
`5.
`
`6.
`
`The DFWMsqueezed light apparatus of claim 1, wherein the repump beamis cylindrical.
`
`The DFWMsqueezed light apparatus of claim 4, wherein the repump beamis an annulus.
`
`The DFWMsqueezed light apparatus of claim 4, wherein the repurnp beam comprises two
`
`counter-propagating annular repump beams.
`
`7.
`
`The DFWMsqueezed light apparatus of claim 1, wherein an input powerof the repump
`
`beam is no greater than about the input power of the one or more pump beams.
`
`2272.3450000/MSB-19-09P
`
`

`

`2% -
`
`8.
`
`The DFWMsqueezed light apparatus of claim 1, wherein the one or more pump beams, the
`
`probe beam, and the vaporcell are arranged in a forward-scattering geometry.
`
`9.
`
`The DFWMsqueezed light apparatus of claim 1, wherein the one or more pump beams, the
`
`probe beam, and the vapor cell are arranged in a backward-scatiering geometry.
`
`10.
`
`The DFWMsqueezed light apparatus of claim 1, wherein the two-mode DFWMsqueezed
`
`light comprises squeezing of at least 6 dB belowshot noise.
`
`li.
`
`The DFWMsqueezed light apparatus of claim 1, wherein the balanced differential detector
`on
`
`12.
`
`The DFWMsqueezedlight apparatus of claim 1, wherein the joint homodyne detector
`
`comprises a pair of homodyne detectors.
`
`13.
`
`The DFWMsqueezed light apparatus of claim 1, wherein the first and second windows have
`
`a temperature greater than an exterior surface of a cylindrical wall of the vaporcell.
`
`14.
`
`The DFWMsqueezed light apparatus of claim 1, wherein a temperature of the vaporcell is
`
`about 30 °Cto about 100 °C.
`
`15.
`
`The DFWMsqueezedlight apparatus of claim 14, wherein the temperature is about 35 °C to
`
`about 45 °C.
`
`16.
`
`The DF WMsqueezed light apparatus of claim 1, wherein a longitudinal length of the vapor
`
`cell is about 0.5 cm to about 10 cm.
`
`17.
`
`The DFWMsqueezed light apparatus of claim 1, wherein the atomic vapor comprises a
`
`rubidium vapor.
`
`2272.3450000/MSB-19-09P
`
`

`

`18.
`
`The DFWMsqueezed light apparatus of claim 1, wherein the DFWMsqueezed light
`
`apparatus comprises a portable diodelaser.
`
`29.
`
`19.
`
`The DFWMsqueezed light apparatus of claim 18, wherein the portable diade laser cormprises
`
`a volume of no greater than about 100 cm?,
`
`20.
`
`The DFWMsqueezed light apparatus of claim 18, wherein the portable diode laser comprises
`
`an cuiput power of no greater than about 150 mW.
`
`21.
`
`The DFWMsqueezed light apparatus of claim 1, wherein the DFWMsqueezed light
`
`apparatus comprises a portable integrated photonic chip.
`
`22.
`
`A method of forming a low-power squeezed light source, the method comprising:
`
`overlapping one or more pump beams and a probe beam, wherein the one or more pump
`
`beams comiprises an input power of no greater than about 150 mW;
`
`interacting an atomic vapor with the overlapped pumpand probe beams to generate an
`
`amplified probe beam and a conjugate beam;
`
`optically pumping the atomic vapor with a repump beam configured to decrease atomic
`
`decoherence of the atomic vapor, and
`
`generating two-mode squeezed light by degenerate four-wave mixing (DFWM)in the atomic
`
`vapor with squeezing ofat least 3 dB below shot noise.
`
`23.
`
`The method of claim 22, wherein the overlapping comprises applying an input powerof the
`
`one or more pump beams no greater than about 50 mW.
`
`24.
`
`The method of claim 22, wherein the optical pumping comprises an annular repump beam.
`
`25.
`
`The method of claim 22, wherein the two-mode DF WMsqueezed light comprises squeezing
`
`of at least 6 dB belowshot noise.
`
`2272.3450000/MSB-19-09P
`
`

`

`-30-
`
`26.
`
`The method of claim 22, further comprising measuring an intensity-difference squeezing due
`
`to quantum correlations between the amplified probe beam and the conjugate beam with a balanced
`
`differential detector.
`
`27.
`
`The method of claim 22, further comprising measuring quadrature squeezing due to quantum
`
`correlations between the amplified probe beam and the conjugate beam with a joint homodyne
`
`detector.
`
`2272.3450000/MSB-19-09P
`
`

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