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Nonlinear microwave optics in superconducting quantum circuits. Zachary Dutton Raytheon BBN Technologies. NIST collaborators Jeffery Kline David Pappas Martin Weides. BBN collaborators Thomas Ohki John Schlafer Bhaskar Mookerji William Kelly Blake Johnson. Slow and stopped light.

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Nonlinear microwave optics in superconducting quantum circuits

Nonlinear microwave optics in superconducting quantum circuits

Zachary Dutton

Raytheon BBN Technologies

NIST collaborators

Jeffery Kline

David Pappas

Martin Weides

BBN collaborators

Thomas Ohki

John Schlafer

Bhaskar Mookerji

William Kelly

Blake Johnson


Slow and stopped light
Slow and stopped light circuits

Light at 38 m.p.h.

(Harvard 2003, CalTech 2005, GaTech 2005)

Hau, et. al Nature (1999)

Kash, et. al PRL (1999)

  • Slow light: Controlling optical pulse propagation through atom clouds with auxiliary laser

    • Now implemented in multiple other systems

    • All optical buffer

  • Stopped light: Coherent information storage and retreival with an auxiliary laser

    • Classical and quantum memory

    • Interface between flying and stationary qubits


Low light level nlo in atoms
Low light level NLO in atoms circuits

Schmidt & Imamoglu (Opt. Lett. 1996)

Yamamoto & Harris (PRL 1998)

Braje, et. al; PRA (2003)

Two level absorption

Three level EIT

Four level EIT with switching beam

  • Atomic slow light and stored light are based on electromagnetically induced transparency (EIT)

    • Sensitive coherent interference effect

    • This sensitivity can be exploited for low light level nonlinear optics

  • Optical switching

    • Theoretically can be done with as few as ~1 photon per cross-section (~l2)

    • Demonstrated at ~ 23 photons

  • Giant Kerr nonlinearity

    • As few as 1 photon in one field can exhibit large phase shift on a photon of another field

    • All optical quantum processing


Progress in coherent nlo
Progress in coherent NLO circuits

Atomic ensembles

CPT(Pisa 1976)

EIT(Stanford 1991)

Slow light

(Stanford 1995, Harvard 1999, Texas A&M 1999)

Stored light (Harvard 2001)

Low light level switching (Stanford 2003)

Single photon storage

(Harvard 2003, CalTech 2005, GaTech 2005)

Entanglement generation & swapping

(CalTech 2007, GaTech 2007)

Solids

EIT(MIT/Hanscom 2002)

Slow light (MIT/Hanscom 2002, Rochester 2003)

Stored light (MIT/Hanscom 2002, Rochester 2003)

Fibers, resonators, bandgaps

EIT (IBM 2005, Cornell 2006)

Slow light (IBM 2005)

Stored light (Cornell 2007)

Low light level switching

(Cornell 2004)

Superconductors

Autler-Townes (NIST 2009, ETH 2009)

CPT (BBN 2009)

EIT (NEC 2010)

Optical switching (Chalmers 2011, NIST 2011)

Quantum Wells

EIT (Imperial 2000; Oregon, 2004)

Slow light (Oregon, Berkeley 2005)

Quantum Dots

CPT (Michigan 2008)

  • The last 12 years have seen remarkable progress in two senses

    • Increasingly complicated EIT based NLO experiments

    • Increasingly complicated systems


Distributed entanglement for qc
Distributed entanglement for QC circuits

1

2

Photon entanglement source

Lehnert, et. al, Nature Physics

(2008)

Superconducting qubits are a strong candidate for scalable, fast quantum processing

Long distance processing both within and between quantum processing units can be accomplished via shared entanglement + LOCC

Requires microwave photon entanglement sources and quantum memory

Teleportation circuit


Quantum illumination
Quantum Illumination circuits

*

?

Target detection error

Coherent states

SPDC

Lloyd (Science 2008)

Tan (PRL 2009)

Shapiro (PRA 2010)

  • Quantum illumination is an interesting new use of entanglement

    • SNR improved by use of joint detection of signal and idler

    • Improves target detection in lossy and noisy (entanglement breaking) channels

    • Also can be used for secure comm

    • Experiments underway at MIT

  • The advantage may be most pronounced for microwaves (i.e. quantum radar)

    • ~100 photons/mode versus 10-6 at optical frequencies

    • The idler requires a tunable delay


Cpt in superconducting circuits
CPT in superconducting circuits circuits

Superconducting quantum circuits consist of quantized phase states

Proposed coherent population trapping (CPT) using three quantized levels of superconducting flux qubit

Sensitive quantum interference shown to be sensitive probe of decoherence


Coherent population trapping
Coherent Population Trapping circuits

g

Dp

Wc

Wp

0.05

0

1

-1

0

  • Coherent population trapping (CPT)

    • Optical fields drive a three-level L system is driven into a coherent ‘dark state’ superposition

    • Dark state is decoupled from the fields due to destructive quantum interference

    • Excited state population (ρ22) is suppressed near resonance


Coherent population trapping1
Coherent Population Trapping circuits

g

Dp

Wc = 0.6 g

Wp

0.05

0

1

-1

0

  • Coherent population trapping (CPT)

    • Optical fields drive a three-level L system is driven into a coherent ‘dark state’ superposition

    • Dark state is decoupled from the fields due to destructive quantum interference

    • Excited state population (ρ22) is suppressed


Eit slow light and stored light
EIT, slow light, and stored light circuits

Wp

  • Back action of matter on light fields

    • Transparency of light fields on resonance

    • By Kramers-Kronig, there is a steep linear dispersion, causing slow light

  • Stored light

    • Dynamical control of coupling field can store photonic information (quantum or classical) in spins of matter field

  • Further applications

    • Kerr nonlinearity, processing, low light-level optical switching, lasing without inversion


Eit slow light and stored light1
EIT, slow light, and stored light circuits

Wp

Wc

  • Back action of matter on light fields

    • Transparency of light fields on resonance

    • By Kramers-Kronig, there is a steep linear dispersion, causing slow light

  • Stored light

    • Dynamical control of coupling field can store photonic information (quantum or classical) in spins of matter field

  • Further applications

    • Kerr nonlinearity, processing, low light-level optical switching, lasing without inversion


Eit slow light and stored light2
EIT, slow light, and stored light circuits

Wp

Wc

  • Back action of matter on light fields

    • Transparency of light fields on resonance

    • By Kramers-Kronig, there is a steep linear dispersion, causing slow light

  • Stored light

    • Dynamical control of coupling field can store photonic information (quantum or classical) in spins of matter field

  • Further applications

    • Kerr nonlinearity, processing, low light-level optical switching, lasing without inversion


Eit slow light and stored light3
EIT, slow light, and stored light circuits

Wp

Wc

  • Back action of matter on light fields

    • Transparency of light fields on resonance

    • By Kramers-Kronig, there is a steep linear dispersion, causing slow light

  • Stored light

    • Dynamical control of coupling field can store photonic information (quantum or classical) in spins of matter field

  • Further applications

    • Kerr nonlinearity, processing, low light-level optical switching, lasing without inversion


Eit slow light and stored light4
EIT, slow light, and stored light circuits

Wp

Wc

  • Back action of matter on light fields

    • Transparency of light fields on resonance

    • By Kramers-Kronig, there is a steep linear dispersion, causing slow light

  • Stored light

    • Dynamical control of coupling field can store photonic information (quantum or classical) in spins of matter field

  • Further applications

    • Kerr nonlinearity, processing, low light-level optical switching, lasing without inversion


Eit slow light and stored light5
EIT, slow light, and stored light circuits

Wp

Wc

  • Back action of matter on light fields

    • Transparency of light fields on resonance

    • By Kramers-Kronig, there is a steep linear dispersion, causing slow light

  • Stored light

    • Dynamical control of coupling field can store photonic information (quantum or classical) in spins of matter field

  • Further applications

    • Kerr nonlinearity, processing, low light-level optical switching, lasing without inversion


Eit slow light and stored light6
EIT, slow light, and stored light circuits

Wp

Wc

  • Back action of matter on light fields

    • Transparency of light fields on resonance

    • By Kramers-Kronig, there is a steep linear dispersion, causing slow light

  • Stored light

    • Dynamical control of coupling field can store photonic information (quantum or classical) in spins of matter field

  • Further applications

    • Kerr nonlinearity, processing, low light-level optical switching, lasing without inversion


Eit slow light and stored light7
EIT, slow light, and stored light circuits

Wp

Wc

  • Back action of matter on light fields

    • Transparency of light fields on resonance

    • By Kramers-Kronig, there is a steep linear dispersion, causing slow light

  • Stored light

    • Dynamical control of coupling field can store photonic information (quantum or classical) in spins of matter field

  • Further applications

    • Kerr nonlinearity, processing, low light-level optical switching, lasing without inversion


Eit slow light and stored light8
EIT, slow light, and stored light circuits

Wp

Wc

  • Back action of matter on light fields

    • Transparency of light fields on resonance

    • By Kramers-Kronig, there is a steep linear dispersion, causing slow light

  • Stored light

    • Dynamical control of coupling field can store photonic information (quantum or classical) in spins of matter field

  • Further applications

    • Kerr nonlinearity, processing, low light-level optical switching, lasing without inversion


Eit slow light and stored light9
EIT, slow light, and stored light circuits

Wp

Wc

  • Back action of matter on light fields

    • Transparency of light fields on resonance

    • By Kramers-Kronig, there is a steep linear dispersion, causing slow light

  • Stored light

    • Dynamical control of coupling field can store photonic information (quantum or classical) in spins of matter field

  • Further applications

    • Kerr nonlinearity, processing, low light-level optical switching, lasing without inversion


Laboratory for bits and waves
Laboratory for Bits and Waves circuits

Oxford/Vericold Cryogen-free DR200-10

10 mK base with 20 HF lines an 100 DC with 2 SM fibers

State of the art superconducting lab facility came online in 2009


Laboratory for bits and waves1
Laboratory for Bits and Waves circuits

Oxford/Vericold Cryogen-free DR200-10

10 mK base with 20 HF lines an 100 DC with 2 SM fibers

State of the art superconducting lab facility came online in 2009


Qubit potential for l system
Qubit potential for circuitsL-system

U

φ


Qubit potential for l system1
Qubit potential for circuitsL-system

U

φ


Qubit potential for l system2
Qubit potential for circuitsL-system

U

φ


Qubit potential for l system3
Qubit potential for circuitsL-system

2 106 0

1 103 0

U

φ


Qubit potential for l system4
Qubit potential for circuitsL-system

2 106 0

1 103 0

U

φ


Cpt resonance
CPT resonance circuits

fc

fp

W. R. Kelly, Z. Dutton, J. Schlafer, B. Mookerji, T. A. Ohki, J. S. Kline, D. P. Pappas, PRL (2010)


Cpt time dynamics
CPT time dynamics circuits

  • Murali et. al. PRL (2004) predicted that CPT could be used as a decoherence probe

W. R. Kelly, Z. Dutton, J. Schlafer, B. Mookerji, T. A. Ohki, J. S. Kline, D. P. Pappas, PRL (2010)


Eit experiment
EIT experiment circuits

  • NEC group recently measured the probe transmission and phase shift in a transmission line coupled to a qubit

  • Traced out the real and imaginary susceptibility

  • Done in a strongly dampled (T1 limited) device, which maximizes the nonlinearity

Abdumalikov, et. al (Science 2011)


Switching
Switching circuits

Li, et. al (arXiv 1103.2631)

Hoi , et. al (PRL 2011)

  • Unlike atomic systems, superconducting EIT is done in a 1D transmission line geometry

  • Absorption and scattering is then replaced by reflection in the line

  • Chalmers group used EIT + a circulator to show a switch


Cpt vs at
CPT vs AT circuits

Ideally one wants the probe absorption line to decay faster than the dark state

  • “Lambda” configuration allows and coupling field broadened EIT resonance

  • Quantum interference “CPT” regime

  • Larger nonlinearities

  • “Ladder” is dark state decay limited

  • “Autler-Townes splitting” regime

  • Smaller nonlinearities

2G

2G

G

G

Im(r)

Re(r)

Im(r)

Re(r)


Slow light simulations
Slow light simulations circuits

  • To get a large nonlinearity one ideally needs a large optical density

  • Larger delay-bandwidth products (~D1/2)

  • Needed to store entire pulse in the medium (D>>1)

  • In our context, this means coupling multiple qubits to transmission line

  • Also need T1 limited device and coupling field broadened resonance

reference

1 qubit

8 qubits


Summary and outlook
Summary and outlook circuits

  • EIT based effects lead to an interesting variety of low light level coherent NLO applications

    • Light buffers, classical and quantum memories, optical switching, Kerr nonlinearity

  • Quantum optics is now being done in superconducting quantum circuits

    • CPT, EIT, squeezed photon sources

    • Important development for quantum processing protocols, quantum illuminati

  • Slow and stopped light may be next on the horizon


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